Ok HUGE SPOILERS for the rest of the novel (=・ω・=)
It’s been a while since I read it so if I have some things wrong feel free to correct me. (Other Novel readers)
OK so Dohyun was hired to be Yeon’s tutor right. But when Yeon came back from the states his mother I believe hired Dohyun back to watch over Yeon so basically Dohyun was paid to be friends with Yeon and report back to Yeons Mom. So while Yeon think them meeting again and thinks them becoming friends is completely coincidental it wasn’t. Yeon then thinks that their entire relationship was fake and that them getting super close was just so Dohyun could report back to his mom. Yeon end things with Dohyun feeling extremely betrayed but Dohyuns feelings for him were never fake and he’s liked him since he’s tutored him but like he was obviously too young at the time.
OTHER SPOILER
Daniel the exact same as Dohyun as in he was hired in the states to watch Yeon be his friend.

Ooo we getting so close to the climax of the story now!! Can’t wait to see how it’ll be drawn (coming from a novel reader)