I have lots of fave roles, but I will just mention the most recent that I've watched:
The lead girl in Spring Waltz
Eugene in Save The Last Dance
Lee Dae Hee in My Girl
Lee Dong Wook in My Girl
Chae Rim in All About Eve
Jang Dong Gun in All About Eve
Janggeum in Jewel In The Palace
Jin Ji Hee in Jewel in the Palace
Choi Ji Woo in Winter Sonata and Stairway to Heaven
Kwan Sang Woo in Stairway to Heaven
Kim Rae Won in Love Story in Harvard
Kim Tae Hee in Love Story in Harvard
......and many, many more....