I've said this somewhere before but there's this line in s3 "every bone in my body vibrate...

I've said this somewhere before but there's this line in s3 "every bone in my body vibrated with the beats of my heart, and the corner of my lips, as if caught by a chain, remained lifted, beyond my control" that is said when dohun meets yuwon for the very first time and gets repeated in different ways but lacking something

"but for some reason even though my bones shook, the corners of my lips didnt lift" in their highschool introduction, and "the corners of my lips, which hadn't moved, lifted" when yuwon protected him and "my heartbeat pounded as if my bones were about to break" during the warehouse thing.

dohun is slowly getting to see the parts of yuwon he loves and seeing his unchanging nature helps him cling to the only version of yuwon he knows. but the fact he thinks yuwon genuinely doesn't like him is what keeps him from being truly happy like he was as a child

after yuwon affirms their bond, his belief on their destiny never wavers again. I think that's part of why he gets so angry/upset when yuwon dares to challenge that belief when they're adults. to dohun, he already got the confirmation he needed but yuwon challenging this again goes against their destiny. this time dohun has absolute certainty that yuwon does love him and refuses to doubt it, unlike in highschool when he was willing to die to let yuwon be happy without him. one thing I think remained the same tho is that dohun absolutely does want yuwon to just say what will make him happy, or else he will take matters into his own hands, but even in adulthood yuwon refuses to let dohun be responsible for that bc he is afraid of vulnerability and of dohun (and also u don't exactly form healthy rships by assuming all responsibility for ur lovers happiness lol)