“When a new police officer has to go undercover as an 'idol group leader' to solve a case.”

Phantom Stars is a new rookie idol band consisting of four male and four female members, managed by 3T Entertainment. However, just one day before the ‘debut state’, a young leader of the group named 'Wolf' had a car accident that turned him into a sleeping prince. The situation is getting worse when the police investigation reveals that someone had cut the brakes of Wolf's car, making it look like an accident.

To avoid any possibilities of bankruptcy, the 3T Entertainment CEO has to hold a press conference and the debut day of the new idol group, “Phantom Stars”. And You, a young police detective, are tasked with going undercover as the leader of this idol group instead of Wolf.

You have ‘30 days’ to solve the case before the group's stage day, which is the first single of the group releasing as well. Not only have to investigate the case but also undergo training in singing, dancing, and fitness to become a well-rounded idol.