The film opens with a man being interviewed about his sister, who has recorded a video diary in which she makes a shocking confession to her friends and family.

Hyun-joo announces to her younger brother Jae-min and his girlfriend Ji-eun that she has an important confession to make, and asks them to record it on video.

Jae-min and Ji-eun initially think she is playing a prank, but to prove her sincerity Hyun-joo bites into her wrist and starts to suck her own blood.

Kim Jee-woon wrote and directed Coming Out as part of a project to distribute three digital short films online.

[5] Coming Out was also included as a special feature on the UK DVD release of The Quiet Family, and a review at DVDActive praised it as "delicate, cerebral and contemporary cinema at its most profound.