No spoilers but it's just a lot of back and forth, ML is an obsessive psycho. MC keeps bordering how he likes him but he doesn't. Lot of MC monologue about being unsure but he's a clever guy but so dumb at the same time.
This art style or the way the panels are reminds me of a webtoon I read a while back and the names of the characters were colours and even the colouring would be quite simple like this. I wonder if it was the same Author. Can't rmbr the name. I think it had multiple couples.
Chapter 19 has an error, think another manga has been uploaded in between certain pages.