Tan Rou had changed into a more formal outfit. She was wearing casual clothes just now. If she were to meet Zhuang Liu's parents in this outfit, she felt that it was not formal enough.
Another reason for changing clothes was that she wanted to forget what had just happened. She also wanted Zhuang Liu's parents to forget what happened earlier. After she changed her clothes, they would not be able to remember that embarrassing incident.
Shen Jing and Zhuang Yan tacitly did not mention what had just happened. They enthusiastically picked up food for Tan Rou, ignoring their own son, Zhuang Liu.
After dinner, the father and son went to the kitchen to discuss who would wash the dishes. Shen Jing pulled Tan Rou to the living room to watch a movie. The plot of the movie just happened to reach the scene where the protagonists got married.