Sun Xiaoli and Sun Xiaomei had lived apart for years. After their parents divorced, each parent was granted custody of one of the twins. But after a tragic accident claimed their mother’s life, the two battered sisters were reunited, and Sun Xiaomei moved in with Sun Xiaoli and their father. Sun Xiaomei found their mother’s death especially hard to accept. She barely spoke and would spend hours alone in her room. Unable to bear seeing her sister so sad, Sun Xiaoli promised that they could share every part of her life from then on. After all, they were twin sisters. Sun Xiaomei took the promise to heart, and before long, Sun Xiaoli’s friends, teachers, and even her boyfriend were all captivated by her. Soon, Sun Xiaoli began to feel that something was off about her twin sister. She suspected Sun Xiaomei was trying to get rid of her. Sun Xiaoli told herself she was just being paranoid. Her twin couldn’t possibly be a threat to her...