@ThecrazyMama888 This song is sung by Shin Hye Sung and it's translated as "Love Hate". :) I love this song and all the meaning applied to Seung Yoo and Se Ryung's pure love.
I need a happy ending, The world need a happy ending, I believe I speak for all the English speakers watching the show. If you don't give us a happy ending, the world, the earth is going to hate KBS