Ha Eun Joong, a detective at Gangnam Police station. He became a detective to try to understand his dad better, who was an ex-detective. However, he discovers that his father, Myung Geun, actually kidnapped him when he was a child. Myung Geun had lost his own son in a building collapse, and as revenge against the man responsible, Jang Tae Ha, he abducted Tae Ha's son and raised him as his own. In the aftermath of revenge, Eun Joong searches for the truth and becomes caught between his two fathers and the woman he loves, Woo Ah Mi.