In the "Forgotten City" where memories can be extracted, stored and traded, Lin Mo, the top memory tuner, can sneak into the depths of anyone's consciousness. He repaired the broken memories of others, but only forgot his own past. One day, a mysterious woman Xiao Lan came to the door with a memory chip that had been "completely erased". This impossible task unexpectedly opened up the hole in Lin Mo's own memory. When he dived into the void, he discovered not only a hidden truth, but also a huge conspiracy related to the survival of the entire city. In this ocean of forgetfulness, he must find his own, lonely island of memory.