The scene with Jin and Sun in the both was definitely one of the most heart-wrenching moments on LOST. I don't normally cry from watching TV shows but by the end of that scene I was bawling. Probably because as the audience you've been following the couple from the very beginning. With the lies and the deceit, in the end they really loved each other. Plus Jin looked ridiculously similar to one of my best friends, especially when he firmly held Sun's face in his hands and told her that he wouldn't leave her side. It was so sad but also so beautiful.