Yoo Leejin, he is a contract killer, His childhood was always told to war for his own life, that is why he became quiet.
Yoo Leejin really loves his family, he cares very much about his family, being warm to his family, friendly.
When Yoo Leejin likes someone, he will always feel nervous when he's with her, he always tries to appear cool and quiet, but he can't help himself from liking her.
When Yoo Leejin have a girlfriend, he always tried to protect her from even the slightest threat.