Lin Wei never thought that the 28-year-old himself would meet the 17-year-old Jiang Yubai again as a "letter opener". As the manager of an antique restoration studio, she unexpectedly received a box of "time capsules" from ten years ago. Inside the shabbiest cowhide notebook, there were dozens of unsent letters, all signed "Jiang Yubai to Lin Wei." And what was written in the letter was exactly the most clumsy love she had missed as a teenager because of her low self-esteem.
Just when Lin was overwhelmed by memories, Jiang Yubai appeared in the studio as an architect - he was the client who commissioned the restoration of old objects, and he was also the person she had been secretly in love with throughout her youth. The old letters became the key to connect the past and the present, allowing Lin Wei to see clearly that the "miss" back then was all a misunderstanding, and also letting Jiang Yubai know that the thoughts he had hidden for ten years were never one-way arrows. When the "past confession" meets the "present reunion", they finally learn to let go of their regrets and rewrite a "love letter of the present" in the adult world.