Song Jaeyoung, a typical high school student, is perplexed when Kang Yihan, a mysterious classmate, suddenly breaks down in tears at the sight of him. Following this encounter, Jaeyoung's life takes an unexpected turn as Yihan begins sticking close by, offering his help with an unusual sense of familiarity. As strange events begin to unfold around him, Jaeyoung grapples with the growing question: Can he truly trust this enigmatic boy who seems to know him so well?
Cen Jing is a detective who is investigating a mysterious thief called the Queen of Hearts. By chance, she handcuffs herself to Ji Shuanrong, a bar dancer who is actually her former client. To get her back on the right path, Cen Jing infiltrates her life and discovers that she is the Queen of Hearts she has been looking for. But as they get involved, Cen Jing realizes there are more secrets behind her identity...
