Yeon U-ui Sunjeong

Yeon-U is easily mistaken for a female student due to his soft and delicate appearance. He develops a crush on Hae-Sol Kang, the most popular student in school. However, due to his shy and timid personality, Yeon-U has never spoken to Hae-Sol even once despite being in the same class.

(Source: WEBTOON, edited)