First K-drama you ever watched ?

Unofficially, without me knowing because it was airing on Tv, and I was too young, it's Boys Over Flowers.

Officially, It's the K2 

Boys Over Flowers in 2009

W : Two Worlds

I was new to manhwa's and  reading Noblesse & TOG . When I caught upto translation when I saw W : Two Worlds  Trailer in which MC comes from manhwa world and it drew me in.

Autumn in my Heart 

Temptation of Wife (2008) watched it with my family, it's the most popular kdrama at that time. 

The OST of this drama is legendary!!!