"Smile after Tears" tells the poignant story of Zhang Jun Jia, a new transfer student who projects an optimistic and cheerful front despite grappling with significant family and financial pressures. His life takes an unexpected turn during a school band club performance, where the radiant lead singer, He Yan Kai, captivates him on stage and profoundly alters his perspective. As the two grow closer, an ambiguous affection quietly blossoms, offering Jun Jia a sense of hope and belonging. However, their burgeoning relationship is tragically cut short by a sudden and devastating car accident, plunging Jun Jia into an abyss of endless longing and grief for Yan Kai. In the wake of this profound loss, Zheng Diao Qin from the school's basketball team gently enters Jun Jia's life, providing solace and a path towards healing, helping him eventually find a smile after his tears.