I'm going to buck the trend and say that I watched the Korean version then decided to watch the Taiwanese version to see what I missed. Turns out I didn't miss anything! So far, the reviewers of this remake can be classified into two camps - those who didn't watch the original and loved it vs those who watched the original and hated this. I'm going to buck the trend and say that I watched the Korean one first and liked it but after watching the Taiwanese one, I like the Korean one even more that I've actually increased its rating!

Why? When I watched the first 2 episodes of this Korean version, I found it draggy but OMG, the first four episodes of the original are even worse! The Korean remake keeps much of the same plot highlights but removes the bits I find super annoying in the Taiwanese version - the annoying attempts at comedy, the super annoying side stories and characters (gosh I really hate the colleagues). Like what's the deal with trying to inject comedy into a tragedy?

This remake just gets to the crux of the relationships between the main leads and important friends. The only thing that bugged me was the Seo Ji Won song - I loved it at first but it got very repetitive and tiring by the third episode. In contrast, the soundtrack of the original Taiwanese was fantastic and well-suited to the plot elements throughout. The Wu Bai song never got old.

In short - just want to watch for the mystery? Watch this Korean remake which has much better editing and is a professional production. Want to indulge in emotions - the sweet love story, the tragedy of love then loss, and endure annoying attempts at comedy which aren't funny - then watch the original which is raw, unpolished (for goodness sakes, mic the actors and remove all the echoey background noise!) but sentimental.