The sound of a musical instrument sounds, and it is suspected that an old friend has returned.
When Feng Yingzhao was twelve years old, everything started to go off the rails. The formation diagram that appeared inexplicably, the unicorn that actively entered the net, the cyan trace that only wrapped around her wrist, and the sound of a piano that only she could hear coming from the far north - all clues pointed to a name that she could not remember: Cang Wu. When the three companions who accidentally broke in and the six hidden guardians of Zhaoyue Pavilion gradually pieced together the outline of the past, she opened a door that should not belong to her under the ice of the endless sea.
There was a blond man she didn't recognize sleeping in the sarcophagus inside the door. Outside the door, the piano player had left to the north.
When the four chess players gradually make moves, she finally needs to make a choice: be pushed towards the truth by fate, or choose to push open the door and walk in on her own. The answer lies in the north, farther north than the Endless Sea - and she must reach the end alone in a world where everyone is trying to protect her.
