"The clocks in the apartment always point to 3:33 a.m."
During graduation season, Chen Mo, broke and down on his luck, finds a luxury studio apartment in Deepsea City for just one-tenth of the market rent. His landlady, Sister Lin, hands him a thin booklet with a smile. "Follow these six rules, and you'll be perfectly safe here."
On the first night, the sound of marbles rolling upstairs suddenly stops. Chen Mo follows the rules, pulling the blanket over his head and holding his breath, but he can clearly feel something sitting at the foot of his bed.
When he wakes the next day, a wet footprint with six toes has been left on the floor at the foot of his bed.
The girl next door in 1204 has vacant eyes. "Did you hear anything last night?"
An old woman in the hallway whispers mysteriously, "If someone knocks at night, whatever you do, don't open the door."
In the mirror, Chen Mo's own face gives him a sinister smile.
He discovers that not everyone living in this building is alive.
He discovers that behind every rule lies a price paid with the life of a former tenant.
He discovers that the "thing" wandering the halls late at night was once a tenant who followed the rules too
Until one day, it broke some seemingly insignificant rule.
"Follow the rules, and you're a tenant. Break them, and you become part of the rules."
When Chen Mo finally investigates the origins of the rules, he uncovers a shocking secret that has been hidden for fifty years. And he himself seems to have been drawn into this eerie game from the moment he was born
Because the clock on the wall, forever pointing to 3:33, is an heirloom left by his grandfather.
Footsteps sound outside the door again. This time
