@Tbh nah, in my opinion ( WHICH IS MINE ALONE) The dark hair guy is the ML. Blondie has been ahead, sure, but dark knight, as she said, makes her feel comfortable. To me, Blondie likes her, but only to a certain extent of being curious about her, where dark knight genuinely likes or loved her as he said, I don't why but you can tell dark knight is trying to get to know her on HER terms instead of his own like Blondieย
It's an action webtoon before being a romance webtoon.
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If it were purely a romance, the ML would be the guy with black hair. But in this case, DK needs someone who can help her in critical moments and handle DK's anger issues. She needs someone calm and intelligent, not someone like JH who can't manage his emotions properly. Just the fact that JH can't stand the sight of blood was already a constraint for him because the path DK has chosen is covered in blood. The blond guy surely likes DK for a reason not yet mentioned other than curiosity. JW has a connection with DK's former boss, and according to Yena, he is looking for someone, so it's possible he knew DK before approaching her.