Hello comes from episode 19 and appears in Teacher Zeng’s memories at the quiz site. That Christmas, Yifei gave Xiaoxian a mouse pad signed by Sky Li Xiaofeng

Episode 19 I'm a Millionaire (Part 1)

Xiao Xian is about to participate in "Who Can Be a Millionaire", and he gave Yifei his only support group pass. She said that she had something to do that night, but she would come as soon as possible to support him, and told him to wait for a few more rounds to wait for her to watch the game. But at the competition site, after several rounds of answering questions, Yifei's seat was still empty. Xiaoxian chose to continue answering questions and waited for Yifei to appear. Everyone was preparing for Zhang Wei's surprise birthday party, which made Yu Mo, who was about to run for her third year, depressed. She made herself a maintenance card for her third year. In order to encourage Yu Mo to join the wilderness survival club, Zi Qiao challenged her. Sekiya received the crayon drawing he drew 20 years ago, and everyone was amazed. Inspired by this, Yuyou bought two time capsules, and Guangu put their most precious memories in them respectively, and agreed to reopen them 50 years later. But Youyou couldn't resist her curiosity and secretly opened Guangu's time capsule.