I wouldn’t say this falls completely into it. We needed to know that they’d love each other even without the last life influence. And they actually chose this path instead of it harming by accident. Plus, Kihoon really did deserve a better life where he didn’t have a permanent injury and lost career dream. Usually they use it in a crappy way but the way they used it this time makes sense to me and wasn’t completely unpredictable

I hate the amnesia trope, I hate it I hate it I hate it I hate it I hate it I hate it I hate it I hate it I hate it I hate it I hate it I hate it I hate it I hate it