This is the first guy he's ever been with and it's irresponsible to jump into a relationship if you're not sure it has a future. This is new territory for him and he cares for Kyuho so he doesn't want to hurt him any further by rushing into anything. I'm not saying it makes complete sense, but I do get it. It's not always black and white when you're the one in the situation.
The panel where they're cosplaying and Yeowoon is doing the thumbs up into the heart HAS to be referencing the Faker/Ahri cosplayer image. I don't think I'm reaching, Korea loves League of Legends. And Faker himself is Korean.
Sorry I only read first chapter but I don't think you have to have a secret crush on your friend to be upset that they ditch you all the time for their partner??? And to decide to go to a tradition that you have with your friend with your partner instead??? Shitty friend behavior.
This is the first guy he's ever been with and it's irresponsible to jump into a relationship if you're not sure it has a future. This is new territory for him and he cares for Kyuho so he doesn't want to hurt him any further by rushing into anything. I'm not saying it makes complete sense, but I do get it. It's not always black and white when you're the one in the situation.