Kim Kibum's family is being tracked by his father's old friends who have a grudge against him. His "body guard" is a man he's already met at a club and has already fallen for... who's also ten years older than him.

Kim Kibum:

A seventeen year old, senior at Genie High. He can be a very kind individual who warms people's hearts at times but usually he's a wild, outgoing diva. He's good in all subjects in school, but science. He comes from a wealthy family and is very popular in school. He really wants to be a doctor when he grows up - if he can't be a doctor then he'll just be an entertainer. He loves singing and dancing, anyways.
However, nobody knows that the almighty Kim Kibum is gay and that he's crushing on Genie High's best health teacher.

Choi Minho:

A twenty-seven year old who teaches health to high school students by day but turns into a ruthless assassin by night.
He takes orders from his boss, Seo In Guk, a drug dealer. His missions are usually to take out s who with In Guk’s drugs and money. He’s an introvert with a multiple personality disorder.

Lee Jinki:

An eighteen year old senior at Genie High. He is Kim Kibum’s best friend; they’ve been friends since middle school. Like Kibum, he also comes from a wealthy family.
He has a lot of girls who fawn over him, but he pays no mind to them. He’s nerdy and takes school very seriously. People find it surprising how he's Kim Kibum's best friend.

Kim Jonghyun:

Twenty-nine year old pharmacist. He and Minho live in a condo together. He has a crush on him, but doesn’t want to tell him since he is pretty sure Minho is straight as a pole. He is unaware of Minho’s ‘’night job’’.