Jeojeun T-Shirt Arae

Don't panic! It's my first time too.

Young-Jun, a college student, is uncomfortable with Seong-Ho, a young man who runs a fruit shop and acts friendly whenever he meets him in the neighborhood. One day, while he's feeling awkward around Seong-Ho who acts friendly again, a rain shower starts, and the two take refuge under the eaves of Young-Jun's house to avoid the rain. As they're about to say hello and go into the house, Young-Jun discovers that his underwear, which shouldn't be there, is showing under Seong-Ho's wet T-shirt...

(Source: Kakaopage, translated)