In order to pay off the huge debt owed by her father, Huang Zixuan, a girl from a 13th-tier city, signed an agreement with Leng Yaozu, the owner of a beauty store. The two became "contracted brothers and sisters". While joining forces to start a beauty craze, Leng Yaozu discovered Huang Zixuan's identity as a "double agent" is revealed, and a thrilling sniper story begins between "the richest man in Beijing" and "the rich girl in Beijing".