Guo Zifan, who has been emotionally hurt several times and has placed his love on the Internet, meets the mysterious netizen CAT on the Internet. The two agreed not to reveal any information about each other in order to maintain an all-talking relationship. At CAT's suggestion, Guo Zifan and his cousin Song Ziwen opened an antique jewelry store called "Bojin". On the day of the opening, Guo Zifan invited CAT to visit. CAT readily agreed, but asked Zifan not to try to find her, which aroused Guo Zifan's intense desire to see the true face of CAT. When he tried every means to determine the true identity of CAT, all the girls who matched CAT's temperament expressed their affection for him. He only has a netizen named CAT in his heart, but who is CAT?