The "Wan Lai Pavilion" ancient book shop in the alley of the old city hides a secret that is thicker than the yellowed pages - the shop owner Su Wan can see the old objects attached to the souls of the dead, and light blue patterns will appear when touched by the fingertips. This is the "inheritance" left by my grandfather before he disappeared, and it is also the only clue to find him.
One day, when she was repairing a manuscript on architecture of the Republic of China, she met Shen Yan, who was carrying an old pocket watch with a blue and white pattern. He is an obsessive ferryman who has lived for hundreds of years. Every time a group of dead souls completes their regrets, his pocket watch will move one more space, but a piece of memory will be lost. His only obsession is to find "the person hiding in the old building." The two reached a cooperation, starting from the antique book shop, and started a series of bonds with the souls of the dead: helping female students from the Republic of China send unfinished love letters, waiting for the return of an old watchmaker who was sixty years late, knitting an unfinished sweater for a single mother...
As the obsessions closed one by one, Su Wan discovered that the patterns on all the old objects had the same origin as Shen Yan's pocket watch and his grandfather's manuscript, pointing to the underground secret room of the "Inkstone Tower" built in the Republic of China. In the dark, the ferryman leader is coveting the secrets in the secret room, and wants to release the evil souls of a hundred years ago to subvert the world.
When obsession becomes salvation and memory becomes the key, Su Wan and Shen Yan not only want to find their lost relatives, but also keep the fireworks and peace in the world - after all, at the end of every obsession is the unspoken "I care about you."
