I refuse to watch Winter Sonata, 1 Litre of Tears, Stairway to Heaven, I'm Sorry, I Love You, A Love To Kill and Koizora because they're sad af and (I think) mostly of them doesn't have a happy ending and I refuse to watch anything that doesn't have a happy ending. lol
I also refuse to watch any drama that Gu Hye Seon is in, except for Boys Over Flowers, that I'm going to finish it one day, I hope, and Angel Eyes, because of Lee Sang Yoon.