I did a lil bit of researching and the flower is called "Platycodon" or "Balloon flower".
It has different meanings in different parts of East Asia. In China, it's used for medicine. In Japan, it's a sign of luck and success.
But most importantly, in Korea where the story takes place, it's a symbol of endless, eternal love






so back when they were in school, did jae hyuk say he hated seo han bin's eyes because deep down he liked them? and the reason he bullied him was a case of internalised homophobia because he hated that he liked him? or did he actually just hate his eyes for no reason?