Wait i need to know what hardship Keith faces anyone know?

Yeonwoo loses his memory in the side stories. I think that’s it

I don’t think that’s it because it said yeonwoo have two child already. In the side stories, they only had spencer at that time. My theory is probably because of spencer and chase’s child.

Yaa I thought I was overthinking but I'm guessing it's something that maybe happens in one of the novels or just hadn't happens yet. Orr mistranslation