Their storyline is exactly as you said! It's touching, heartfelt and done in a sensitive way. More importantly? It's believable and realistic. I can totally buy it, their feelings and reasons for their actions and most of all, I can totally see happening what's gonna happen to both of their families. Which is why I'm so fond of this storyline. I really think it's groundbreaking for Korean mainstream tv.

And yes, they're so pretty. Whenever they're on screen, I awww, sigh and think, "oh so cute!" *draws hearts around KS and TS*

PS: I'll snag a few screencaps. Thank you!
PPS: this guy uploaded the shippy bits. It's an useful link when you want to get a quick fix of The Cute without having to ff through millions of eps. But hey, many scenes related to their storyline are missings. Just an FYI.