I think TOP knows about people knowing he’s dating Kim Ha Yul, not everyone know, because it’s not a popular ‘rumor’, there is not much proof for like, All K-Pop to make news about it, even though they’re dating.
In recent interviews he’s been stressing (talking about it over and over) about having a girlfriend, and giving out hints that he’s ‘lonely’ or he doesn’t have a girlfriend, without completely saying: ”I’m single”, but he’s obviously trying to clear up this rumor that he’s dating and trying to make it clear that he’s not dating, ….even though he is. If it comes from his mouth over and over that he’s ”single” and ”lonely”, then fans will eat it up and of course believe every word he says, even though he’s just trying to protect his personal life and his girlfriend, he’s indeed dating, but he’s doing a good job with covering up the fact that he’s dating Kim.
(that picture is from the music video that she was in ‘GD&TOP-Oh Yeah’)