(poetic) hibiscus (in the context of Korea; the hibiscus is the national flower of South Korea)

beautiful

(archaic) beautiful

infinity

(formal) Female third-person singular pronoun; she, her, girlfriend

(colloquial) a girlfriend (a female partner in a romantic relationship)

(literary) they (about women or girls)

a flower / Short for 生け花 (ikebana): flower arrangement / Short for 花札 (hanafuda): Japanese playing cards / the best days of one's life / the best thing / essence

(と〜) thinking that […] (with the next clause explaining that the truth is contrary to expectations)

to seem, to appear