This is literally one of the most beautiful but heartbreaking moments in any drama i have ever watched.
JYJ's Junsu sings 너라는 시간이 흐른다 (roughly translated as 'Time only flows when I'm with you')
Fantastic OST, Fantastic drama. I sincerely urge you to go watch it when you can!
Video courtesy of Dramacool.com
All rights go to SBS Korea
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