Unidentifiable:
Encounter
This is probably one of my favourite dramas for this. They are just so... easy in each other's company. I've seen comments that complain about their supposed lack of chemistry, but I disagree. It doesn't need to intense - sometimes gentle love is perfect. I found it a very relaxing watch, as I never, ever had to doubt their feelings for each other. They also communicated, which is a massive plus.
Oh, yes, I love it too much. Park Bo Gum is so hot with long hairs, the begging in Cuba is so amazing. I will for sure rewatch it.