This is a heavy door, and inside the door is imprisoned the lover Su Qing who Shen Hao once deeply loved but now wants to control. He carefully arranged this secret room confinement and thought he was the director in control of the overall situation.
However, the chess game suddenly changed. Another woman, Chen Xue, who was entangled with his life, appeared like a ghost, holding the spare key in her hand that could subvert everything. She stood outside the door, becoming the only and most unpredictable connection between Shen Hao and Su Qing.
The door separates two desperate worlds. Inside the door is Su Qing, whose life or death is uncertain and confused; outside the door is Shen Hao, who is gradually being swallowed by anxiety, powerlessness and fear. He was once a superior manipulator, but now he has become a supplicant, his dignity peeling off inch by inch under Chen Xue's cold gaze.
In the end, Chen Xue chose to turn around and took the key key with her, disappearing into the neon lights and shadows of the city like a falling leaf. She did not open the door or hand back the key.
Shen Hao was left outside the door forever. He couldn't hear any sound from inside the door, so he could only slap and roar wildly, sinking together with his distorted and collapsed face in the mirror and the photo that symbolized the sweet past. Hope and despair were torn apart repeatedly, nailing him to eternal waiting and suspicion.
What did the eyes behind the door see? Is it Su Qing's ending, the abyss of human nature, or a fate that has been foreseen and inescapable? The novel depicts the dark corners and emotional cages in the hearts of modern urbanites with a cold and freehand brushwork. The ending ends abruptly, leaving endless suspense and thinking to Shen Hao outside the door and every reader staring at the closed door.