I went into this drama based on the 9.0 score it has on MDL, but was a little dubious because the written reviews were so bad... it almost made me not watch it.
This drama is a great watch, a nice script/story that maybe deserved better execution, but all in all, what's not to enjoy about our leads?
They had chemistry, they acted well, their storyline was good... what is so wrong?

Well, I'm not going to lie, there are quite a few plot holes, the time travel could have been done a lot better.... The killer, coming out of nowhere and following through time was really badly done, but the essence of the drama, the connection between 2 people who love each other, and always find ways to bump into one another regardless of the year (back or forward) was a nice watch.