i think he just stays out (maybe he stays with his friends), coz it was only implied that he smelled like a different soap from their dorm when he comes home. though I kinda wanna see the raws to confirm its translation. but i dont think Kana slept around
he smelled like different soaps so it’s highly likely that he was sleeping around, especially since they didn’t say anything about that in the end. guess it didn’t really matter to most since they weren’t in a relationship yet
Sometimes I forget that he’s Lee bin and gok child that we saw as a innocent baby