A Love to Kill - This was one of my very first Korean dramas, and I loved it... until the ending (take note of the "Tragedy" label). Back when I watched it I didn't know it was a Tragedy, and it's one of the main reasons why I try to avoid them now. But if you enjoy gut-wrenching, heart-wrenching, horrendously sad endings with ugly crying (rivers of tears and snot), then I'd recommend this one.