How can Zi Qiao and Meijia be boyfriend and girlfriend again?

Decoration) and Meijia (Kimi

Although she became boyfriend and girlfriend again, Lv Ziqiao's playboy nature hasn't changed, and she still seems to like picking up girls very much, which really gives Meijia a headache. I don't know how Zi Qiao and Meijia can be boyfriend and girlfriend again. I've watched all 24 episodes, but I haven't seen them.