@Faylinn Yes!! The pink-haired guy just doesn't feel sincere when he does all this. All he can seem to tell her is that she's pretty, and he treats her a bit too delicately-- as if she's not a real person. I mean, usually that's meant to be sweet, as if the guy thinks that highly of her, but combined with the way he's trying to push her into giving him her number, or spending time with him and talking to him, and doesn't crinkle his eyes when he smiles, a huge sign of honesty (when Bunny imagines Yeol doing the same things,
his eyes are crinkling, so it's not the art style), didn't bother remembering her name before... it's just really suspicious.
Plus, this is barely their second meeting. He's too relaxed for the amount he says he likes her. He says he's surrounded by women a lot, so surely he realizes with his experience that he could scare her off by being pushy? Smiles don't brush over everything. Alternatively, him being surrounded by "pretty women" a lot sounds like a veiled allusion to playerhood.
Sigh. I was suspicious of him from the start, anyway-- they introduce him in the context of her being targeted by scammers! XD That doesn't mean anything in real life, but it sure does in a story.