You are Lee Yoona, sister of Lee Eunhyuk--a very famous detective in Seoul. Your brother has the ability to see ghosts, helping him solve some cases. You are often jealous of your brother and often wishes you were like him. Your wish came true alright--but not the way you planned it. Now, with your newfound ability, you must find out which one of your brother's "friends" murdered him...

Dangerous. Sadistic. Vile. This is a tale of nine men—known as the Masked Men—whose job is to rid the world of evil people—and send them to hell. When a wind of change blows to their direction, one of the team members if forced to choose—between duty and love.