Yifei and Nuolan, how should Zeng Xiaoxian choose? How should the relationship between Ziqiao and Meijia develop? What's wrong with Yoyo? What's going on with Sekiya's red eyes? ... IPartment 4 left many pitfalls for the audience. Due to the expectations of fans, Ai 5 has been delayed, so I decided to fill in these pitfalls myself! Dear spectators, if you don't like it, please don't spray it!