At age 25, Park Sera is Korea's aspiring top psychologist sought after by South Korea's prestigious hospital. Not to mention, she worked closely with the police to evaluate criminals' personality and behavioural patterns. Park Sera is pretty much a celebrity with the immense amount of popularity received from her occupation.

A genius? No, Park Sera worked all her life for her title. 

Her secret? Despite accepting the offer to work at S.K Hospital, she hates the director of South Korea's prestigious hospital. 

Mark Tuan is a meticulous detective working under South Korea's National Police Force. At age 27, he had received endless recognition from people for his ability. However, no one knows about him in particular, apart from a few friends that had gained his trust only after long years of friendship. 

Mysterious? No, Mark Tuan has secrets he had to keep from the world. 

His secret? He is a runaway son from a certain remarkable family. 

When the golden opportunity for Sera to end her long years of hatred, she grabs it fast and tight. At the same time, she finds herself tangled in the life of a cold, capable jerk of a detective, Mark Tuan and stays close to him knowing that he would be able to help her in her revenge.