Looking for a webtoon

Ok so basically I read this WEBTOON/manwha a couple years ago and I wanna read it again but I literally can’t remember jackshit about it. The girl has black hair and the guy maybe has orange hair I don’t know I can’t remember. I remember she’s like super quiet and he’s popular and like befriends her this is set in like a university setting. I remember she’s confesses to him while they were drinking beer and having fried chicken and he tells her he doesn’t feel the same way. And later during like the university festival or whatever he sees her walking in a maid? Costume and she’s with another guy who I think has black hair and starts to feel jealous and wants to win her over. I remember after they get together their whole friend group goes to the beach or something and they main are about to do it but stop because the main lead was wearing embarrassing underwear and their friends are watching them from the window lol. I also remember they live together at the end manhwa.