Plot
Yoo-bang (Lee Beom-soo) sneaks into a villa at night and discovers the dead body of Chunha Medical Group executive Ho-hae (Park Sang-myun). His niece Yeo-chi (Jung Ryeo-won) is hiding in the room. At the funeral, both Yoo-bang and Yeo-chi get arrested for murder. How did things come to this? It all began three months ago when Chunha began trial testing for their new medicine. In exchange for a job recommendation from Ho-hae, Yoo-bang agrees to join the trial testing and steal information about the drug. Rival company director Hang-woo (Jung Gyu-woon) is also there undercover to find out about the new drug. Spoiled rich girl Yeo-chi is undergoing training because her grandfather wants her to inherit Chunha one day, though she herself is completely uninterested. For the trial testing, 30 testers, including Yoo-bang and Hang-woo, are shut off from the outside world for 10 days. During the trial period, strange things begin to happen...
