The Lost Lineage of the Mountain and Sea Town in the City

At 2:20 a.m., programmer Xiao Yi finishes working overtime, but the elevator in his office building stops at a nonexistent twelfth floor. The doors slowly slide open, revealing a dense darkness. A pale hand reaches out from within and makes a shushing gesture.

From that moment on, Xiao Yi's peaceful life as a programmer is torn to shreds.

He discovers that beneath this bustling modern city lies a hidden "Inner World." Monsters from the Classic of Mountains and Seas are seeping into reality through spatial rifts, while ancient Taoist arts and modern technology clash in the shadows. And he himself, as the last successor to Maoshan's Hidden Sect, is the only one who can fight these monsters.

But that's not the most terrifying part.

The most terrifying thing is that he begins to wonder: Is he really Xiao Yi, or something far more dangerous?