When architect Su Wantang was sorting through his late mother's belongings, he discovered a sketchbook from 1998, which was full of drawings of a young man named "Shen Yan". As the memory fragments gradually pieced together, she uncovered the secret of her mother's secret love that had been hidden for twenty years, but unexpectedly found that she had fallen into a similar emotional dilemma as her mother - she had a secret love for the man named "Shen Yanzhi" in the design institute. The secret love trajectories of the two time and space quietly overlapped, and finally in a cherry blossom festival that spanned twenty years, a double redemption of regret and growth was completed.
