The protagonist is a craftsman who restores old things. Every time he picks up an item (such as a broken graduation album, a rusty wedding ring), he will hear the story of the owner of the item. One day, a man sent a broken ceramic cat, and behind it was an agreement between him and his late girlfriend. When the protagonist repaired the ceramic cat, he also helped the man get rid of his obsession, and the two gradually fell in love in the process of "repairing regrets."
Concept: Old things are containers of time, restoration is a gentle response to "regret"