This should have been titled "Heartbreak" not "Heartbeat." The actors were all good and they had great chemistry. Also, the storyline was quite good from the beginning. but the ending ruined everything. The writer and director did not even consider doing a twist to allow Sun Woo-Hyeol (Taec Yeon) to live on. And YES, he died! I would have accepted if he just lived, human or not. All the struggles he went through just to die in the end and be just a memory in the end was totally bad. Seriously, it was the first time I cursed whoever wrote or thought of the ending. I've watched other K-dramas with bad endings, but by far this is the worst. I'm not sure if there will be any Season 2 but if it's the same bad ending, I'm not looking forward to it. If you're cruel and like bad endings, then watch this. If you like happy endings, better skip this one and look for something worth your time.