Moon's Things

Can someone please recommend some manhwa's similar to Just Twilight, Just a girl he knows, The password is 002, Daytime in the bunker

If you use Character.AI while you are in a relationship, is it same as cheating on your partner?

For context, I have never been in a relationship, never fell in love with a real person, like love from the books, series. I had a couple of crushes when I was in school but that's it. And I'll be 23 in a couple of months.