Pei Yuxin likes a line from "Forrest Gump" - Life is like a box of chocolate, you never know what you're going to get. (Life is like a box of chocolate, you never know what you're going to get.) Just like her and Su Mo, neither she, 12 years old, nor 22 years old, could predict that the beginning of their comedy was just for a tragic ending.
When he was 12 years old, Su Mo firmly believed that meeting Pei Yuxin was like opening Pandora's box, and nightmares hit him one after another. He didn't understand until he was 22 years old - perhaps, Pei Yuxin opened Pandora's box when she got to know him.