It's 25 episodes long, but so much happened in the first few episodes. It started really well but seemed like they were blowing through the plot too fast. Everything in the plot summary seemed to happen in the first 5 or so episodes, and the series kind of fell apart.
~SPOILERS~
The whole taste exchange thing didn't make much sense because they never really investigated or explained it. Maybe I wasn't paying much attention to it, but I didn't understand why it was his taste. Was it just because he was her first kiss? Because he had perfect taste? Not sure. I chalked it up to "drama logic" and ignored it.
The murder plot was just too random and boring for me to care much about it. I knew the "villain" the first time he met the FL because he was acting too suspicious. No wonder he got caught. The last five episodes were murder-plot-heavy and just bogged down the whole series.

The reason I gave this such a high rating was because of the acting and the romance part of the drama. The acting was nice and the leads had enough chemistry to make an unbelievable plot slightly more believable.