LOL it's okay!! it made a lot more sense when i read posts about it, and a lot of it is just up to interpretation. but it's basically jin being sort of...in denial or shock about what happened to everyone in i need u, and he's just seeing them through his memories. he thinks they're still there with him until he sees that picture in the end. earlier during the prologue, rap mon took the picture of him and suga, but at the end he sees that he's the only one in the picture (so the others were never there to begin with). most people are unsure about V, but people think he's either killed himself too or he's in a really bad state after killing that dude. so complicated!