For the most part, Yoojin Han grew up with a normal life and family. Two parents and a younger brother. Of course, the birth of his younger brother wasn't taken well upon their parents. Because of it, Yoojin took it upon himself to look and care after Yoohyun as both his older brother and parental figure which led for their parents to adventure and travel like Newly Weds. Taking it in stride they began their path to act as if their children were no longer their own, continuing to do what they loved without any worry. Yoojin was aware this was not how parents should behave but their neglect didn't affect him as much when he had to be strong for his younger brother. He did what he could, bringing as much happiness and love as they both deserve. A fatal accident soon became of their parents which led to their deaths and leaving the children orphaned but still Yoojin did his best to take care of them as he dropped out of school to raise him. What was once a relatively normal world began to change as various "dungeons" started to appear everywhere. As they came to being with the dungeon shock, even humans begun to change- awakening to a rank that was determined from the start and allowing them access to abilities and growth that is anything but human. Despite Yoojin's brother awakening into a S rank, the highest of the tier, Yoojin awakens as a F rank which is consequently on the opposite end. It was from then on that Yoojin begun to truly understand just how far that gap is between such ranks. A bridge began to form between the two of them, Yoojin feeling his younger brother grow more and more distant as the pride of South Korea's youngest S rank came to the spotlight and leaving Yoojin in the shadows. His life began to fall into pieces as he struggled to make something of himself. However, the higher his younger brother raised in fame, the lesser he became. His struggles led him to a darker path, doing wrong and bad, becoming quite the thorn in one's side as he faced nothing but a cold shoulder from his younger brother and never met with him again.

It wasn't until Yoojin's troubles brought him into a dungeon and almost his death that he ran into his younger brother. His younger brother who risked his life to save him soon died before his very eyes. Given Yoojin's ability "Caregiver" and Last Repayment skill, he was able to take advantage of his dead brother's abilities and use it to kill the beast that killed him which earned him a Legendary title 'Dragon Slayer' and Wishstone which while stated unable to resurrect the dead he then decides to go back 5 years into the past. So while now being five years younger, he keeps all his memories of those five years of what has yet to come and happen. With this knowledge in mind, he chooses to become a better person and support those around him and live a more carefree life. That is until he gets a mission put upon him to gather S ranks and raise them. Yoojin begins with Bak Yerim. Making a promise with his brother that if he brought an Unawakened person to him with potential of being high rank he would loosen his worries. The promising S rank not only adds to his growing list, but he even takes a small horned flame lion under his care given from Yoohyun. To not be exposed for his new abilities, and high ranking ones at that, he disguises it as a monster rearing skill and starts it with Peace, the now named horned flame lion baby. So now a father of a new monster and Guardian to Bak Yerim, he starts to work on quietly sending them to their growth of getting stronger. While this proves useful to his younger brother's Guild he knows it isn't something possible to keep quiet for long.

Which is why it isn't long before the attention is spread to the rest of the large guilds within the country. Not wanting to expose too much of his worth, given no matter how high his skill rankings are, he's still essentially a stat F rank and can easily be killed. So he continues to stay mostly quiet with his true abilities, giving Yoohyun only the minimum not because he doesn't trust him but because with his apparent knowledge on dungeons and suddenly amazing skills.. isn't that not too suspicious? With negotiations in place to offer his services in growing a monster for each of the guilds, he gets a monster rearing building out of it as well as their protection. He continues to lay down some work on the side that ropes in some useful help from a researcher and even a hunter who goes by as a Dokkaebi. Of course it isn't all good things, given it isn't much longer until he's kidnapped by men who work as an associate guild to Haeyeon with one from MKC guild. Greed being too tempting that Yoojin finds himself almost shipped away along with Peace. However, his encounter with Blackie - a lizard of the Curse and Poison type leads to more unfortunate events for the kidnappers while giving more power to Yoojin. After killing the Guild Leader and his vice man, he patiently waits to be rescued and returns home once his younger brother finds him with the help of Bak Yerim and Kim Sunghan. The usefulness of gaining these temporary abilities from Blackie allow him the opportunity to attack dungeons alone to raise his level and hopefully undercover more information regarding the System.

Amidst his dungeon dipping he stumbles upon Chirpie, a baby chick monster F rank while gaining some titles with.. well, nice skills but would be better on an A rank or higher and not an F rank like himself. During one night, he ends up being visited by Riette. Another S Rank interested in him with intentions of providing a monster baby onto him. The feeling of Cursed and Poison dragon leaves him with questions that he starts to unveil but for now sends her away, The meeting is shortlived and while he considers dungeon he stumbles into one that deal with a familiar group that swindle and toss Unawakened people to monsters. Running into his past again he does not hesitate to kill them the very same men that tried to kill him before his regression while keeping Bak Hayool safe. The idea of Awakening does consider the option of him helping awaken others rather than leaving it all up to Awakening centers. At least to not miss out on opportunitys of hunters with very special skills. A discussion of such a topic with Sung Hyunjae and his brother Yoohyun seem to find a common ground. As Yoo Myeongwoo finishes preparations and learns his new Forge skill do things seem to take a better turn in events. All of his planning seem to be going well hand in hand. However, with events leading to now, he finally gets an opportunity to explore a dungeon with Yoohyun and Peace in tow but also meet with the System people. As he learns more about his mission, the results of what it meant for their safety in escaping the approaching end to this world and why it was necessary for him to gather S Ranks.. it's at the cost of keeping silent about it and not being able to know everything. Though his brother's worry seems dangerous he manages to explain things (fortunately at no cost of losing any limbs) while letting his brother know more about his actual skills. Leaving out Our Brat, Last Repayment and Lauchitas' Natural Enemy. Without any further trouble, he comes to take in new monster babies to begin rearing training. Of course some monsters proving more troublesome than most.. but it's the cons of being a sudden busy monster dad.

While helping promote Yoo Myeongwoo's new skill, Yoojin once again and unsurprisingly becomes busy again. After making sure no lies rest between him and the new Forger, he tries to focus on using Our Brat to extend growth on those currently attuned to the keywords. Peace finishing his growth, leading him to settle on Yoohyun and Yerim. Not to mention Myeongwoo as well. Another was Kim Sunghan, who he finds out has completed the minimum to head towards S rank growth and so starts to make plans to go dungeon attacking with the group. It deems successful with the coordination and Yoojin's quick thinking of skill usage and future knowledge of the sudden attack of an SS-rank monster. Because of the exhaustion mentally, Yoojin ends up sleeping for two days after the attack and wakes up to learn of Yoohyun's attack to an S-rank dungeon alone with Peace. Despite Yoojin's Fear Resistance he still gets worked up over it and while he does his best to stay focused on tasks at hand he isn't entirely unaffected. He manages to grow Dokkaebi and Blue further, meeting with Noah who is Riette's younger brother and someone who at first attacks him after the keyword is applied but proves to be a useful addition to his list of Brats. Even so, after that encounter he promises himself he will no longer be adding Awakening human S ranks due to the dangers of it. So, he will instead focus more on baby monsters. Meeting with the System people does shine more information to Yoojin, but not enough when it comes to a "cult" proving to be trouble not only to the system people but also involving themselves with some of the Awakened. In hopes of gathering intel on said cultist he enters a dungeon with Sung Hyunjae and Noah to bait their source. Maybe Yoojin should have been better prepared, being ambushed by not only two other Guild Leaders and their hunters but Riette as well. It proves truly to be a fairytale-like story as Riette (the now apparent dragon) kidnaps Yoojin. He's spared given she truly holds no ill intentions towards him, and for the most part manage to escape almost completely unharmed. If only things could stay that way, after breaking the contract placed on Hyunjae does he meet an unfortunate encounter with a man fused with cursed and poison dragon types, Ancient dragon human of poison and curses type, Diarma who seems to be the source of contracts with not just Hyunjae but his brother Yoohyun as well. With the system people getting involved, and some own quick thinking of his own part, he manages to deal with the lizard man without any serious harm to himself and more information than he could have been prepared for. The one who has his dead brother's corpse, the memories taken from Diarma of the plans and outcome of other sources.. he isn't left to dwell in it for too long as they leave the dungeon to meet face to face with his younger brother.

He does meet with Myeongwoo, who crafted Eunhye which he gave to him. Though his enounter with Diarma gives him some ideas in which Yoojin cuts above his heart open, putting in the cracked black magic stone and the white ss-rank magic stones combined into himself as a means of overtime growing a dragon inside him that will follow and obey his command whenever it's born. Some time after that, a water dungeon broke out, and Yoojin came to meet yet another cult member. The group of him, Bak Yerim, Yoohyun and Hyunjae attacked said dungeon and successfully cleared it. On orders to relax, Yoojin instead causes a little bit of.. destruction to clear up the distrust being forced upon his younger brother. To ease the pressure on Yoohyun.

It isn't long until Yoojin works with getting himself "kidnapped", to learn more about who was targeting him and his brother. Leading him to Hong Kong, which he ran into Hyunjae and learned of a whole people trafficking system going on with high rank Hunters. In joining forces, the pair took down the system and making sure it disappeared entirely and wiping out anyone involved. Yoohyun, Yerim and Noah end up lending their aid too. With the help of Irin, Yoojin was able to use some powers he's inherited from Diarma to have a discussion about Yoohyun with the fire elemental. After that, he starts to make use of the sudden vacation he had on hand. But Haeyeon's high ranking people like Yoohyun, Yerim, even taking Peace leaves Yoojin to continue taking a break, until a forced dungeon breaks and he's pushed to go investigate. Unaware, he becomes bait thanks to the magic stones in his chest, leading to a dangerous encounter but even after it's dealt with.. Taewon despite working with Yoojin threatens him to be careful and forces his Fear Resistance skill to be 3 ranks lower temporary (About eight days, more or less.) Hyunjae comes to his rescue, though the fight comes to a quick end with no causalities between the S ranks. Returning home, Yoojin comes face to face to Yoohyun and does his best to hide his secret until Yoohyun has Yoojin taking sleep inducers without his knowing. Leading to Yoohyun asking Hyunjae what his brother is hiding from him.