That's alright Kobisa if you think JYH doesn't like SH ( in a romantic way ) its fine.
AS for me, in my opinion, i still do. And my observation is right, i know coz' were both "cancer", partially i have a little idea how cancer think and act.
I have nothing against Seo, the girl is beautiful no doubt about that she's even more beautiful than our Princess, but im feeling this girl is too timid and a little bit stiff ( so sorry but thats how i see her

) unlike our princess, PSH whose always warm and full of vibrant, happy, colorful aura. And we cancerians are so attracted to happy people, we always like happy sorrounding, situations,events everything thats colorful, bright and sunny. That's why i know JYH is attracted to our princess and he also like HOngke ( he sure is sunny to be around

).
JYH really is close to SH same with Hongke. But if you will look closely, the way SH's reaction between the two, SH is more aware of JYH as a man rather than a close brother (Hongke). There's no BTS where i've seen YH putting his arms around her shoulder just like Hongke always did to her (meaning they are aware of each other being a young lad and a young lady and it would look so unappropriate for them to do that.). true, Hongke and JYH are of different personality but SH allowed Hongke to do it while in JYH's case its different.
Don't mind me Kobisa, just loving my thoughts.
when i look at you my face gets red
when i see you my heart goes thump thump
i talk with shyness like a kid
when i look at you i just smile out of nowhere
like a fool I keep doing that
I think love came to me