Chen Yaoyu has known Lin Er for one year, and Lin Er has known Chen Yaoyu for four years and eight days. It rained heavily at the end of the night when he went to KTV after graduation. Lin Er cried in the rain. Tang Shouen rushed out to hold an umbrella for Lin Er. He asked, why are you crying. Lin'er just kept shaking his head, wiping his tears desperately. The year Chen Yaoyu participated in the show, the program team said that he could write letters to the trainees. Lin Er wrote several letters but finally gave up. On April 6, 2019, Lin'er clicked on the space of the contact whose profile picture had been grayed out for several years, and posted a sentence on the message board, "Thousands of times, I will always miss you with the glow in my eyes."