A direct effect of being turned into a drama means the webtoon is now commercialized, forcing it to become pay-to-view.
The title is "우리집에 사는 남자" which translates to "A man who lives at my home".
The man is a young girl's stepfather who she had never met before the webtoon starts. Apparently, her deceased mother had an affair.
The thing is that the man is younger than the protagonist.
Something happens between them as the plot goes on.