In particular, it is a girl group that has been drawing global attention as its unit and the full-length album has made it to the top five on the Billboard World Albums chart.

HeeJin is the first member of the LOONA to be unveiled and participated in the contest for handwriting on Naver's Hangeul Day to register the "The Lunar orbit," a sharing handwritten letter, and made a meaningful move in celebration of Hangeul Day.

"Hello, I'm LOONA HeeJin. I've come to participate because I can't write my fans' favorite handwritten letters often," she said, expressing her affection for the fans and even the public that came across the fonts.

The font name "The Lunar orbit," in which HeeJin participated in the contest, stands for "Oh Bit," the girls' fan club name of the month, and fans who heard the news said, "HeeJin feels more proud today." "HeeJin is the best. Thank you," and so forth, showing keen interest in the fonts registered by HeeJin.

Since her career, he has been active in various fields, ranging from music broadcasts to entertainment shows, including KCON 2019 LA, The Salt Tree Tour and starring a masked singer.