Umm.. for me, KJH is not even a red flag at all. Just look at how he showed up almost every time Yeon-oh was in trouble. It's just that the blond Ko guy was jealous in Yeon-oh and wanted to destroy him. So it's nothing about KJH. KJH didn't even know that at all. He's just tracking about Yeon-oh's work schedule and NOTHING ELSE, okay?? He did his best to help Yeon-oh. And he knew what he did wrong (about the misunderstanding) and he's WILLING to apologize.
So just ask yourself if there's someone who's gonna use $750k just to save you when you get kidnapped one day???