Lin Xiaoman, a 23-year-old social worker, accidentally discovered a magical "Collection Book of Regrets" when he was sorting out the old bookstall left by his grandfather.
It cannot record the present moment, but it can absorb the unfinished regrets scattered by others. It can also pull her into the parallel fragments corresponding to the regrets, deliver brief reminders as an invisible observer, and help people put their sincerity at ease. But every time she completes the regret loop, she loses an insignificant memory in exchange for energy.
From the guilt of children, the love letters of the Republic of China, to the concern of veterans, Lin Xiaoman gradually grew up in each regretful story that spanned time, and unexpectedly reunited with Jiang Yu, the boy she had a crush on in high school because of her inferiority complex. As the memory loss intensified, she discovered that the notebook was a family inheritance, and her grandfather had already known its secrets. Her debt to her grandfather and her regret for Jiang Yu were becoming the most difficult hurdles to overcome.
This is a journey about regret and redemption. Lin Xiaoman will eventually understand: all regrets are unplaced sincerity. Only by facing the past can we cherish the present.