Lin Shen, a top architecture student, returns to his hometown for a funeral, only to stumble upon a century-old village taboo: the four ancient relics that guard the Four Symbols are changing one after another.
A stone mill cracks open, and a bizarre arm reaches out. Xuanwu is decapitated, and a procession of ghosts follows in its wake. A letter left by his great-grandfather reveals the truth: beneath the Four Symbols lies a Yin-Yang Well that leads to an "ineffable place." Its seal has begun to loosen, and in forty-nine days, calamity will devour everything.
To find the four scattered treasures, Lin Shen is forced to step into the deadly feng shui trap his great-grandfather laid. He must obey a series of eerie "rules": never look at your reflection in the well at midnight; never turn around if you hear someone calling; the ancestral hall's candles must never go out... Meanwhile, hidden forces have already marked him and the entire village as sacrifices to open the ultimate gate.
When the countdown reaches zero, he faces the ultimate choice: become the new guardian and remain trapped between Yin and Yang forever, or uncover the whole truth and release whatever lies in the well?
