Both films are about the dark reality of homosexual sex workers

Both are Japanese language BL films about male sex workers.

-Japanese BL
-Tough life of call boys
-Dark themes

Abuse of power/corruption

Both movies tell the same true story based on the Hello Kitty Murder Case.

-Torture during investigation
-Human rights
-abuse of power

-Torture during investigation
-Human rights
-Chinese Language
-Abuse of power

Both films show the injustices and tortures that occurred in political prisons

government/military wrongful imprisonment and violent interrogations

wrongful imprisonment and violent interrogations

Both have a side plot involving unrequited love stories which are similar to each other.

Both have a psychological, mysterious, and thrilling plot that unfolds throughout the series.