Gatekeeper

So I found a manhwa on Instagram, didn’t think much of it. But I saw that the person who made the video is gatekeeping, maybe not intentionally, but they keep removing anything mentioning the name of the manhwa. There was platinum blonde and a like dark plumb hair colour mc. They mention a dude named Kim Joo-Hwan he has like yellow hair and glasses. I’m just wondering if anyone knows what this manhwa is based on these simple facts