When Hyosung got home from work, she found her and her father's house trashed. Door ripped open, broken glasses everywhere, furnitures broken, papers spread around the whole house, it would take weeks to clean this mess up. But that wasn't her biggest problem.

The biggest problem was... her father was missing.

He's a special agent, and Hyosung knew he was working on a difficult case. When he was struggling with a case, he would always stay in his office until morning. So when he disappeared, Hyosung decided to find out if the case had something to do with him disappearing. She goes to his office building and talks to several of his co-workers, but they have no idea what case he was working on.

She goes through his things, and to her surprise, she finds her father's private work phone in one of the desk drawers. He never goes anywhere without it. When she turns it on, there's several un-opened messages and missed calls from someone called "GD". She's never heard of him before, but quickly traces his number, like her father taught her to do when she was younger, and finds his house address.

She soon finds out that his name is Kwon Jiyong, and that her dad helped him find a job, and they have stayed in touch ever since then. Thankful for helping him, Jiyong decided to help Hyosung find her father along with his four other roomates...

These six will go on a journey together to find out where her father is, and who kidnapped him..

Hyosung

Jiyong

Seunghyun

Youngbae

Seungri

Daesung

Yongguk

Kris