I think that
Mama is the OP of tear jerking kdramas. The romance is cute, the actors are cute, and the story made me cry for 24 hours straight,
enjoy! (24 episodes)
Also, if you like Jdramas and want to try a crime show tear jerker check out
Ouroboros, I finished it today and I cried a lot the last 5 episodes or so. It was beautiful. (10 episodes)