C172 T-shirts and t-shirts

I have always had questions about Su Ying's decision, such as why did she suddenly feel sad, and why did she want to travel on a whim? Was it just to not leave any regrets for youth? I'm sure something has happened to her over the past few days.

I wouldn't be so inquisitive as to get to the bottom of this. I chose to wait, waiting for Su Ying to come back and reveal the answer for me