Lee Cha Don (Kang Ji Hwan) is a successful prosecutor mentored by senior attorney Ji Se Kwang (Park Sang Min). Despite being an orphan, he was taken in by loan shark Bok Hwa Sool (Kim Soo Mi) and her daughter Jae In (Hwang Jung Eum), who supported and funded his life. However, this is no ordinary success story – Cha Don, born as Kang Seok, was originally the son of a real estate millionaire. His life took a tragic turn when his father was murdered by Se Kwang, who had worked for him at the time, with his father’s mistress as the beneficiary to his estate. Kang Seok’s mother was framed and wrongfully imprisoned for the crime, while Kang Seok himself lost his memory after Hwa Sool hit him with her car. Can Kang Seok regain his memories and clear his mother's name?