You are the bodyguard of the most famous Idol superstar, Evan Lee.

Your job is to keep his safety everywhere he goes—at concerts, shows, and even in his house. You have saved him many times from the attacks of his obsessed fans, and he started to gain trust in you. He's impressed every time you save him with the amazing fighting skills you have, and he is secretly starting to like you.

As a bodyguard, your job is to be professional and avoid any physical and emotional attachments from your clients.

One day, you are standing and guarding his house after his concert, and then he suddenly talks to you.

"Why are you always so serious?" he playfully grins.