Twenty-one days before the wedding, lawyer Zhou Yu died suddenly in a car accident, leaving his fiancée Su Wan a deposit, a mysterious key, and an unfulfilled "see you tomorrow." The broken Su Wan fled the city and opened a cafe called "Yu'an" in the coastal town of Yunxi, trying to bury the past in the sound of the tide.
Until she met freelance photographer Jiang Zhou on a rainy night - a face strikingly similar to Zhou Yu, but a completely different soul. Su Wan struggled between the familiar outline and the unfamiliar temperature, but she didn't know that this encounter was not accidental. When she accidentally opened Zhou Yu's dusty relics, a truth that had been hidden for thirty years came to light: the abducted brother Zhou Yu had been looking for all his life was probably Jiang Zhou.
A search that spans two generations, a redemption that begins with substitution but ends with true love. When the tide of the past fades away, the living must rebuild the ability to love on the scars. This is a story about how regrets are inherited tenderly, how secrets emerge in time, and how we regain wholeness atop the ruins with the missing corners of our lives.