What happens when a murderer falls in love with the principle of a high school? Choi Bo-Yeong is the daughter of murderer Choi Byung-Soo and principle Choi Go-Eun. Byung-Soo fell in love with a woman that is named Go-Eun. Surprisingly she loved him back, she didn't care if he was considered the most dangerous of all Seoul, she married him anyways. Later on they had a kid and named her Bo-Yeong which means a jewel, precious, rare, a pedal, and a flower. Since she was born around a dangerous town, Byung-Soo decided to make her join him in his crimes. She doesn't care and finds his work amusing. Although she plans to become the next murderer in town, when she meets Jungkook, the bully of the school, EVERYTHING changes.