I don't know how I feel about youjin saying he only likes hyung for his looks

He's a simple-minded person, so that's the only reason he can come up with. I think it's because he likes hyung (not just because of his looks) that he thinks hyung is the most handsome. Only through the lenses of love that hyung can be at the ultimate level of handsomeness in this world.

He feels love and admiration, but that is the *result* of his feelings for him now, and not the *cause* for those feelings to have grown in the first place. Before hyung pursued him, Jin didn't even recognize him or realize who he was.