No one!

I do not think she is romantically interested in either of them.  Her focus is currently to study and obtain good grades - this is how it should be too!

 Yellow Wonders:

Geonhu for sure because I like how bold he is

Being Bold by embarrassing hae yi everywhere without her consent. Is that what you mean. His behaviour is totally obsessive and stalkerish.

it is SJ, SJ, SJ period, primogenital entrants with good heart and personality should always win.

This wasn't the case with true beauty, I hate ML who leaves without saying and then come back. 

SJ does have baggage, but he share his pain with FL unlike True Beauty thats why he should say. 

Gunho is a gold kid, but SJ is right for her. This is a only difference between them.

 Tejas:

Being Bold by embarrassing hae yi everywhere without her consent. Is that what you mean. His behaviour is totally obsessive and stalkerish.

I get why people didn't like his acts. also I'm not someone who likes attention or stuff like this just like hae-yi. I wouldn't call him "bold" either lol but going as far as calling him obsessive and stalkerish and bringing consent here is too much. they are just high schoolers ffs people do dumb things when they're young

with me 

If Haeyi wants some romance after high school, then give it to Geonhu to be her romantic partner!