Choi Yeonjun is the youngest son of an affluent family. His parents work in the political field, his older brothers both are being raised to take after them while his sister is being forced to study medicine by their parents as well. As for Yeonjun... well his story is a little bit different. Believe it or not-- he isn't even their actual child. In fact Yeonjun was sold to them by the underground child trafficking ring. He fetched a high price simply for the fact he was the perfect weapon. Before being sold to the ring in the first place his family had been a rough one. Filled to the brim with assassins, despite being only an infant he was expected to grow up to be just as lethal as the rest. Unfortunately for him-- he turned out to be a waste of time in their eyes, unable to do the dark things they wished upon him. 
 

Naturally he was given hell because of this, abused, broken, and destroyed for two years until he was four years old. Upon his fourth year on earth his "family" sold him off to the black market where they expected him to fetch them a great price as he was a young, cute child who obeyed and never disrespected orders. In all senses of the word, Yeonjun is a genius. Even at the age of four he could understand when to listen and what not to do. He was quickly sold to the family. Sadly for Yeonjun, what should have been a positive outcome led only to further pain and injustice, hidden away as a secret child to never been outed to those in their lives. He was raised by the father of the household to be nothing more than a hitman. His emotions were beat out of him, his fear erased by torture and brutal lessons, and once when he cried out after being whipped-- he was taken to a doctor where a surgery was performed to make sure he never repeated the mistake again. Yeonjun is mute due to this procedure. 

He killed his first victim at 14, and from that point on he was a pawn. Nothing more than a dog who dealt with his familial issues, cleaning up the crimes committed and fully ready to take the fall if so be it. At 18 his mother started to sell him off to men with a power trip, the poor kid having no sense of self worth at all. It was on his 19th birthday that he finally had enough. He realized that he was stronger than those who had raised him to be like this. His mother and his father had been arguing often recently about their marriage, complaining about pain between the two of them. They were weak. His brothers, knew nothing of fighting, and his sister-- well she was pathetic to start with. He killed them all, a horrific massacre that had been broadcasted on the news. There was not a single drop of evidence at the crime scene, no cameras had been on and not even the maids within the house that night remained alive to tell the tale. Currently, Yeonjun resides in a small apartment within the city, living off the money he smuggled from each and every hit he had pulled off from 15 until 19. The boy has no job, no friends, and no family to speak of. He occasionally will leave the house to kill again, targeting those who were within the ring he was sold to, as well as trying to track down his rightful family to give them their dues. 

Yeonjun is an emotionless 20 year old with absolutely no sense of morals nor right versus wrong. He does not feel guilt for anything he does-- nor remorse or anger during the killings. In his mind, his life is made for one thing and one thing only- to eradicate those on his list. He has no ambitions, no dreams, and no passions. He is a husk of a boy-- one who proves hard to fix. Unless someone is daring enough to try.