You have to watch Boys Over Flowers(꽃보다 남자). It's everyone's gateway drama lol.
The Moon that Embraces the Sun(해를 품은 달) is my favorite historical drama.
Angel Eyes(엔젤 아이즈), Reply 1988(응답하라 1988), and Reply 1997(응답하라 1997) have all made me cry. I'm currently watching Moorim School (무림학교) and it's...