Peace/Synopsis

History
A little less than 3 years after dungeons appeared in the world, in early April, Peace was found as a cub in an S-rank dungeon by an attack team of Hunters from Haeyeon Guild led by guild leader Han Yoohyun. Knowing that the Horned Flame Lion would make an excellent kiseungsu if he could be tamed, they took him out of the dungeon and placed him inside a greenhouse in Han Yoohyun's house.

However, after 2 months passed, he hadn't grown at all. A beast tamer hired by Han Yoohyun correctly guessed that it was due to some special conditions being needed for his growth. Since the Flame Lion cub was essentially useless if he couldn't grow into a kiseungsu, Han Yoohyun began to consider getting rid of him.

Original timeline, pre-regression
Peace was never heard of in the pre-regression timeline. Presumably, with no opportunity to raise and tame him, Han Yoohyun killed him to keep him out of other guilds' hands.

Synopsis
Peace encounters Han Yoojin when the latter is wandering the halls of Han Yoohyun's house. Though initially wary of him, once Han Yoojin gets his Owner's Token, Peace calms and becomes friendly with him due to the influence of his skills. Over the next few days, Han Yoojin continues to feed him, play with him, and take care of him. During this time, Peace also gets trained to associate the words "I love you" with food. Eventually, Peace is moved from the greenhouse to a pen in Han Yoojin's room, where he explores and breaks some of Han Yoojin's things along the way. He is also introduced to Yoo Myeongwoo with only a little commotion, and to Bak Yerim with a great deal of commotion.

When Han Yoojin is brought back from his night out with Kim Sunghan, Peace is agitated at seeing him unconscious and doesn't rest well until he sees him awake and alright the following morning.

At some point since meeting Yoojin, the constant affection means the keyword is successfully applied to Peace. Yoojin therefore uses his growth skills on Peace. After being brought to a meeting with Yoohyun where they discuss the possibility of Yoojin taking up kiseungsu rearing, Peace is scheduled to be trained under Yoojin to maximize the effects of the skill. Under intense training, Peace grows rapidly, going from a body weight of 2.8kg to 9.2kg a mere 3 days later. He enjoys the training, killing monsters viciously and playing with Yoojin. As he grows, Yoojin moves him from the installed pen to his own bedroom to hide how big he's gotten.

Once the training is over, Peace quickly begins to feel stuffy in the employee dorms. Despite playing with Yoojin in the limited space (and breaking a TV along the way), he is agitated enough to quickly become aggressive when Seok Simyeong visits and is overbearing and excitable towards Yoojin.