Someone's snooping around CEO Park Sian's home, searching through his office, and even sending him strange texts. The suspect? Employee Yeh Damin! However, Damin isn’t interested in her boss at all. She’s just been tasked with secretly reporting information on him to someone dear from his past. Not knowing this, Sian fears that Damin is out to get him, which drives him to obsess over her. But could what seems like obsession be turning into… love? And when can Damin stop all the sneaking around?!