What are the movie plots that I didn't care about when I was a child and remembered when I grew up?

When I was a child, I thought Tongfu Inn was a comedy. Now I can't figure out why Laobai and Yu Xiang got married twice. Although the first time was a fake marriage, the second time both parents saw it and slept separately. Moreover, Lao Bai still sleeps on the table at the door. He could have made the floor in Yu Xiang's room. Once Yu Xiang was in a good mood and sewed a mattress for Laobai. The two men disagree. Yu Xiang is going back again.