Mo Yilin met Ni Jing in college, and the two became best friends. They both talk about everything, but they both have secrets in their hearts. With the appearance of Dan Dong, the two people who used to be sisters began to go against each other.
Mo Yilin didn't know what role she played in Shan Dong's life. Dan Dong was Ni Jing's boyfriend, but she, Mo Yilin, became Dan Dong's lover. Ni Jing and Dan Dong had been together for three years, and she had been secretly following Shan Dong for almost three years behind Ni Jing's back. Mo Yilin sometimes wonders if she is a little exception in Shan Dong's heart, and also wonders if Shan Dong has other women.