Auto-translated YouTube versions. The nuances of the final reveal (the “incest” taboo) are utterly destroyed by machine translation. You need human-curated Vietsub to feel the tragedy.
To find the version with Vietnamese subtitles, you can look on popular regional streaming and community platforms: Oldboy (2003) Director: Park Chan-wook - Facebook oldboy 2003 vietsub
When the infamous hallway fight began—a single, grueling take of a man with a hammer against a sea of thugs—Minh stopped breathing. The yellow-tinted subtitles pulsed: "Tao sẽ giết hết chúng mày" (I will kill you all). Auto-translated YouTube versions