The film is written by Ko and also presented, produced and directed by Adam Tsuei and stars Simon Yam, Lee Kang-sheng, Kaiser Chuang, Ivy Shao and Sophia Li [2] Filming for The Tenants Downstairs began in October 2015 and ended in November 2015 and was released on 12 August 2016.

His tenants include divorcee Mr. Wang Ming-kai and his fourth-grade daughter; Ms. Chen Min-hui, an office worker who uses her body for financial gain and advantages in the workplace; Mr. Chang Kuo-sheng, a physical education teacher who enjoys peeping on his neighbors and is infatuated with Ms. Chen; Bo-yan, a geeky college student obsessed with the idea of having superpowers; and a gay couple, Kuo Li and Ling Hu.

The Landlord hides, and watches as Ying-ru drugs the man with poisoned tea, then ties him up in the bathtub.

A few days later, Ying-ru drags a bound woman back to her apartment in a suitcase, and also tortures her to death in her bathtub.

The Landlord tricks Bo-yan into thinking he has teleportation powers, manipulates Kuo Li and Ling Hu into believing the other is being unfaithful, allows Mr. Chang to break into Ms. Chen's room and have sex with her, and adds an aphrodisiac to Mr. Wang's mosquito coil to give him lustful feelings towards his daughter.

After Chang was released, he left the police force, went to the building, and began accepting tenants there.