In Xu Zhiyi's world, there is always a clear and insurmountable boundary between work and life. The person she was yesterday and the person she is today seem to be two completely different existences. Her love is like a broken mirror, scattered into pieces that cannot be put back together. When she was young, she had loved the equally young Xu Yaolin so sincerely and passionately. Perhaps now she was no longer attracted to the Xu Yaolin who had been polished by years, and the young she had never had any feelings for the mature and unfamiliar him now. As for Xu Yaolin, it seemed that he had never had any affection for the young and simple Xu Zhiyi from beginning to end. Now Xu Zhiyi has solemnly made a promise to him, promising not to disturb him again in this life. They were originally moving forward peacefully on their respective marriage tracks, fulfilling their responsibilities as spouses and partners, living a stable life, and even being considered happy and complete in the eyes of outsiders. However, no one expected that the gears of fate would turn quietly in silence, binding the two people together again in an incredible way. A sudden total lunar eclipse brought them, who were in different cities, looking up at the night sky, back to their elementary school classroom many years ago. Xu Zhiyi, who worked hard, still tried to keep the promise of peace in that life even though he was trapped in the vortex of time and space misalignment; and the reincarnation of the second life has been unfolding in the dark, silently continuing to write the unfinished fate. What kind of reunion will these two young and passionate hearts have, and what kind of story will they experience?