Detention (2020) Parents Guide: Is the series OK for kids?

Sexual content is limited to mild romantic tension and implied relationships between students and a teacher. There is no nudity or explicit sexual activity, but some scenes hint at deeper connections.

Violence is strongly supernatural and psychological, featuring terrifying apparitions, jump scares, and characters being physically thrown or restrained by unseen forces. A character commits suicide by jumping from a building, and there are visual effects suggesting ghostly attacks and possessions. Blood is visible in some scenes, particularly after a character's death or during ritualistic acts.

Language is infrequent and generally mild, with characters occasionally using words like "damn" or "hell" in moments of distress. There are no instances of strong profanity or slurs.

Substance use is minimal. Characters are seen casually drinking alcohol in social settings, particularly adults, but it is not a central plot point nor is intoxication depicted.

This season deals with heavy themes including suicide, mental manipulation, identity loss, historical political oppression (White Terror period in Taiwan), and the trauma of past events. Characters experience severe psychological distress, grief, and abandonment. The overarching theme of a vengeful spirit seeking redemption also touches on justice and sacrifice.