This is such a weird ass cope. Setting the scene up isn’t dragging it out! This convo is just above your head.
We know they die- it’s hinted at a bunch! Nothing here is a mystery. It’s clear as day season 2 ending is going to be when we get back to present so steal in for the ride. We’re getting introduced to them as a couple. How they operate, their flaws and sincerity.
Just because you’re impatient and can’t understand story telling… doesn’t mean it’s unnecessary.
My point remains the same. So many chapters of show them just fucking dumb and then Kihoon running away for the 500th time it's not working to "set the scene" here. You don't have to talk about it as something profound, not working either. Their modern-day versions had sex because the red thread dictated it, and that's what moved the plot forward at least lol.

The parallels of their past life is the same as their modern life- Kihoon does things to push away and hide from Yeon. Whenever Yeon tries to get him to commit or open up- he fails. However, he’s pushing away Yeon with his words and still taking his dick…
EXACTLY HOW WE FOUND THEM IN CHAPTER 1
The pattern is the same, the communication is the same, and cycle is the same.
THAT IS PLOT!!! This is why media crisis is upon us.