This is the 17389th most frequent Korean word.
선종이
The Korean word "선종이" translates to "paper for folding (origami paper)" in English.
선종이가 is used metaphorically here, likening delicate markings to those associated with aesthetics of Seon Buddhism.
그 나비 선종이가 너무 아름답다.
That butterfly's markings are so beautiful.
선종이 here means 'passing away', used in the context of someone experiencing loss.
그는 갑작스러운 선종이를 안고 살아야 했다.
He had to live with the sudden passing that occurred.
선종이 refers to Seon Buddhism, a sect within Korean Buddhism.