The drama of my life. Please do not count this drama out because of what others think of the ending. Watch it and make your own decision. Some of my most favourite and precious dramas have had endings that wouldn't qualify as "happy" but the story they told, the performance the cast gave, the directing was all perfect.

As far as I think, stories cannot be measured by endings. They exist to give us much more. That is the beauty of 2521.

And if that doesn't convince you, Kim Taeri and Nam Joo Hyuk are perfect.