Before Sunset
I watched this movie halfway through before realising that this was not the first part, I didn't even realise this and this is testament to the beautiful storytelling and the narrative. The movie is just essentially a long conversation between two people who meet each other after a long time and just the mere conversation between is able to express what they felt and takes the audience through their whole journey while also being subtle about their emotions about things.
Honestly one of the best written movie you will ever find.