You're a paid kller. You have been ordered to kll Jisung on the day he's announced as the next ceo for Astd Corp. The one who paid you is his uncle who can't accept the fact he's going to take the role as CEO as he's still 25 years old and the youngest ceo.

The day when you about to kill him, you're ready at your spot before he even came, but you got shot by other people, and your body fall off the building and Jisung who's the one who secretly save you.