Just started watching this even though I know it's probably going to be terrible, because I feel like my education…
This was my first kdrama a couple years ago and it got me hooked... If not for the plot, watch it for the cast... everyone did an amazing job!! You might want to be prepared to have SLS though - I rooted for the main couple the first time I watched it but when I rewatched it a week ago I felt so bad for the second lead. Also, I should warn you about Lee Min Ho's cringy English...