I'm confused did taegun not remember him and all this when they met again?

i think he did but i’m not sure if he was able to tell that it was eunsung on the roof top

I went back to chapter one and it doesn't seem like taegun knows him at all, like he doesn't remember him as a classmates from high-school or anything...

what I could’ve sworn he talked about how they knew each other in high school and then also when taegun Went to save eunsung he said he knew that his high school life was bad but not that bad