Actually, I never finished reading the novel since the translation got deleted. However, according to a spoiler I saw, the MC and Yohan only got together in college. Something also happened between them in high school. It was a misunderstanding, so Yohan ignored Kang Jun, and Kang Jun ended up getting bullied.
The last chapter I read in the translated novel was when Yohan started spending a lot of time at Kang Jun's house, even sleeping there. One day, Yohan's father called, and Kang Jun was the one who answered the phone. That was when he noticed Yohan had a lot of pictures of him on his phone, even from when he was a first-year. They weren’t classmates or even close at that time, and the pictures were taken from afar. That made him realize that Yohan liked him. I’m not sure, but I didn’t fully understand some parts of the translation in that chapter.
My god, I remember reading the novel, and this scene is pissing me off so much. I hate Junwoo and Tae-san—I don’t even care about them (they could just fcking die). Now, reading the manhwa is even more irritating. Damn, I just want the story to focus on my Kang Jun and Go Yohan!