Heart-touching

This is one of the most romantic k-dramas I have ever watched. The most heart-touching moments of this series:
Hae-in's last sentence for Hyun-woo in 1st episode and when Hae-in's father let her know that Hyun-woo contacted all around the world for her treatment in episode 14.
Both the hero & heroine acted skillfully. They both are my favourites. I have seen these countless times. Love you all.