Yeah Jihwan stated that he realised his feeling for Jun after living together but also he said that of he didn't have any feelings for him before than why would he have asked for Jun's help, there were so many others who were willing to.
So I think he did habe feelings for him since the beginning but it wasn't clear.
And about Hyesung, I agree with you.
I think he did have feelings for Jihwan but since he was rejected he couldn't say he liked him in a romantic way so.
About Jihwan. Yea but he literally called the girl his rival. Because she loved Jun. And he said it himself that he had a hard time keeping people away. You can't be doing that and not know your feelings....that's god tier stupidness.
And about Hyesung.it seems as if the conclusion, that the author wants to give, really is "Hyesung realised long ago he didnt want to date Jihwan" (because it was stated as Hyesung's true feelings) even though thats not how he is actually acting.
It's like to author wants to tease us by making him over affectionnate.
Then tries to brush it off "oh no..everything he did was just for the sake of family love. And thats also why Jihwan lets him.do as he pleases"
But it failed as the author pushed it too far and it just looks like he was still inlove.
Well one can't exactly figure out feeling easily but I agree with you in Hyesung case. (●'◡'●)ﾉ
SPOILER
Wasnt it stated by Jihwan that he only realised his feelings as he lived with Jun??? And yet after Jun met that girl because of his father, Jihwan claims he was keeping people away from Jun... That's weird.
Also Hyesung told the MC that he only saw Jihwan as family and that's what he wants. But he was so obsessed with Jihwan that the people at his uni were shipping him with Jihwan. Also Hyesung told Jun it'd be bad if he liked Jihwan in uni(he said it in a way as to push Jun away). And when Hyesung drank with the teacher, he was talking how he got rejected by Jihwan and treated as nothing more but "family". And of course he was super affectionnate with Jihwan until he found his lover. He even tried to get rid of Jun and take care of Yul instead of Jun.
Everything is pointing out that Hyesung liked Jihwan until he falls for the teachers. Yet he goes and says "oh i realised long time ago that i dont want to date him".
That was very irritating.