In the future city, memories can be repaired, extracted and even traded. Lin Mo, the "memory restorer", can dive into the sea of other people's broken memories, but he can only recover his own lost past. He repaired other people's regrets day after day, until a mysterious woman named Su Qing came to his door with a commission to "delete memories." When he dived into the core of her painful memory, he was horrified to find that the stormy lighthouse and that cold and desperate night were exactly his own nightmare. Repairing her memory may piece together his own identity, but it may also drag the two of them into an abyss of eternal destruction.