In the summer of 2019, Chen Zihao discovers his class's top student, Yang Yuhang, is his secret pen pal. Their connection deepens, but looming exams test their newfound closeness.

Modern woman Ma Qianqiu time-travels into a princess's body and pretends to be lovers with General Qin Che amid deadly power struggles. As secrets unravel and love grows, Ma Qianqiu must choose between going home or staying for him.