Kang Yeo-Joo (Cho Yeo-Jeong) is a best-selling writer. She only writes crime stories, dealing with cruel murder cases. She constantly thinks about how to murder people for her novels. Kang Yeo-Joo is married to Han Woo-Sung (Ko Jun). He is a lawyer, specializing in divorce. He wrote a memo to his wife stating "If I cheat, I die."
