Hi. I'm looking for the name of a manga/manhua/manhwa I started but didn't finish. The premise is a poor high school girl who is forced into an arranged marriage with a famous author who wrote erotica.

If I remember properly, the girl is a bit of a nerd or unpopular and there was a potential love triangle between her, the author, and childhood friend who suspects the arrangement.

Thank you for your help!

Your description fits Billion Girl exactly. https://www.mangaupdates.com/series.html?id=1341

Thank you; this is it!