Responses
I don't think someone like him is able to love in the first place xD Then on page 1 he admitted that he always hangs out with the brother to have personal advantages, so he wanted to get closer to him just for this reason, and (spoiler of the next chapter)...............................................................................he admits that he hit on jiwon just for a personal challenge or something like that
I'm guessing that Hweemin had a crush or was in love with Alex's older brother but the brother didn't return his feelings or Hweemin knew the brother wouldn't like him like that so the next best thing was to go after his little brother.
Probably to fill the hole...Haha..pun intended. ╮( ̄▽ ̄)╭