i’m pretty sure it’s a manga, not a manhwa, but i may be misremembering. i get a lot of ads from ebookrenta and the like, and i’m pretty sure this was one of them. basically it’s about three idols, and the main character ships his other two members together and i think writes fanfic too. they find out about this and then have a threesome with the main guy. and that’s pretty much it lol. i tried looking for it and can’t find it so if anyone knows the name it’d be greatly appreciated m(_ _)m thank you!