I think a romcom should have the couple expressing their like for each other around chapter 100, however that does not mean it should end at 100, I just would like it if they sorted out their feelings by then. Stories about dating are often more interesting then will they or won't they get together.
And now time to do one of the worst thing about korean manhwa, season endings. This means the artist can change and until it resumes hiatuses for who knows how long.
I thought the author already created the 100 page story and then was releasing it one day at a time. Otherwise there is no guarantee that he will be able to end it in 100 days.