Oldboy
This is genuinely a mind fuck movie,
the first time i watched this it left me speechless because what was that plot twist and the ending too like damn it gets you wondering how can anyone ever write something like this 😭 (peak tho)
This is also the type of movie where youd empathize with the villain but also hate him, maybe that just makes him a beautifully written character, same goes with the main character.