Shen Yuan and Xu Qing met again at a class reunion four years after graduation, and their lives have undergone earth-shaking changes. Xu Qing had a secret love for Shen Yuan, and Shen Yuan had a secret love for Bi Dan, but the three of them never revealed it. Shen Yuan and Xu Qing, who had not contacted each other for four years, reunited for a class reunion, only to find that Bi Dan seemed to have disappeared from the world. In order to find Bi Dan, Shen Yuan launched a series of clue search activities. Xu Qing, who had a crush on Shen Yuan, also participated in this activity in order to help Shen Yuan achieve his goal. The two pieced together the fragments of clues they had found. Bi Dan's whereabouts became clearer and clearer, and their understanding of Bi Dan became more and more in-depth. Finally they found Bi Dan, but Bi Dan's appearance made them at a loss.
Concept: love, the truth behind disappearance, friendship