Confession of Pain is a 2006 Hong Kong crime drama film directed by Andrew Lau and Alan Mak, starring Tony Leung, Takeshi Kaneshiro, Shu Qi and Xu Jinglei.

Yau initially thought that he will be angry with his girlfriend's lover, but he ends up taking care of the comatose man in the hospital.

Later, Lau lures his partners-in-crime to a rundown house and murders them, after which he attempts to make the scene seem as though the two of them killed each other in a dispute over the loot.

After a long investigation, which includes a few dangerous confrontations with a "suspect", Yau discovers Lau's secret and dark past.

Lau returns to Susan's room, where he feels overwhelmed by guilt and eventually commits suicide by shooting himself in the head.

The Mandarin theme song in the Chinese version, Secret of a Forlorn City (傷城秘密), was performed by Denise Ho.

The Japanese release rights went to Avex Trax, with the title "Kizudarake no Otokotachi" (傷だらけの男たち), which roughly translates as Heavily Scarred Men.

Sponsors of the film include: Giorgio Armani, Ayumi Hamasaki, 1010, San Miguel, Citicall, Philip Stein, D-Link, Neway and APM.

Leonardo DiCaprio's production company, Appian Way, is producing the film alongside Roy Lee, who brokered[11] the remake deals on Asian movies from The Ring to Infernal Affairs.