In this generation, everybody were scared about the killer.

There was a killer as known as Black Peaarl in seoul but nobody saw her before.

She can kill any person with her finger. 

She, the killer, Kwon Yuri....

Yuri became a killer because there was some reason. Her father and mother was killed by somebody when yuri was two years old. Yuri was adopted by a killer. The killer trained yuri how to use gun, how to fight, how to seduce guy, how to avoid police and may more. The killer has a son named Lee Donghae. Lee Donghae fall in love with yuri at the first sight but yuri is hard to fall in love. Lee Donghae always protect Yuri when Yuri was in danger.

One day, the killer gave yuri a mission to kill a guy who is the Oh's one and only son, Oh Sehun. If Sehun was dead, Donghae can be the Oh company's heir. 

Oh Sehun, the flower boy and the richest guy in the campus. He such a playboy who loves to lay with girls and leave them for no reason. 

When the mission was started, everything was change.