Responses
Some people just don't want to jump into sex?? Or want to wait. And that's perfectly fine, it makes sense for Myunghan to want to take things slow because his last emotional relationship resulted in years long of trauma. I also have problems with the lack of interaction between the main couple but why dwell on sex? Sex does not legitimize a relationship.
Just my thoughts :)

what a weird ass ending you're two grown men and you can't even broach the subject of sex with actual maturity? You've already been dating for an indefinite amount of time, and now given South Korean conscription laws will wait another 2 years before consummating your relationship? Seriously does everyone in this plot feel the need to handle Myunghan with fragile care? His childish innocence just gets old after a while, like gain some sort of social aptitude please.