30-Year-old Ren Yian was struggling with work and life. He accidentally dug out a letter he wrote when he was 25, and fell into a dream amidst collapse and self-healing. After traveling through time as a boy, Su Zimo, she faced the loneliness and hurt of her childhood (Rui Jialei's bullying, Chang Xiaoran's betrayal, He Nianzhi and Li Muzhi's cold eyes), and grew up with little Ren Yi'an as a "childhood sweetheart", filling the gaps in her childhood with her adult mind. From campus to society, the two redeemed each other in the fetters of "pseudo love", and finally woke up and returned to reality. Ren Yi'an took the courage to reconcile with himself and embraced life again.
