This drama tickled my curiosity because I recognized Park Shin Hye and Lee Yong Hwa (both also co- stared in You're Beautiful)I though it would be a fair bargain because I liked their chemistry in the previous show unfortunately they didn't end up with each other on the said drama. Now back to Heartstrings, Let's see Plus Points? I liked the set, the location of each scene was nice, I liked the fact that musical instruments were involved, and that they highlighted skill in playing. The cast was likeable, I think they played their parts well enough to satisfy viewers, those who should play instrument knew what they were doing which is a biggie on plus factors. I also liked the fact that all the main characters have their own partners so nobody gets really bummed in the end :D and the best was the OST, I have to say I liked the songs that they played in this drama even the instrumentals, I wasn't disappointed at all in that aspect. Low Downs? There are handful of low downs as of this story, The story line for me it wasn't all so well made, the beginning was slow but it gets better by episodes 4 or 5 if I remember it right. But the story focused too much on the the production they were doing the centennial celebration, that I think it's too long for a certain undertaking. The story would've already showed other developments if it wasn't for that. And by approaching the end episodes it got too fast and the ending is weak for me, it wasn't the optimum resolution for the characters, I think it was particularly unfair for Lee Sin, watch it for you to understand. I also think Gyu Won abandoning the gayageum was sad, after being an advocate for traditional music. I also didn't like the potrayal of the bulimic girl (she's bulimic, binge eating then, guilt in eating that much so she purges all that she ate, THAT'S BULIMIA ALRIGHT) she needs certain type of intervention for her to get well ,they kind of sent the message that it's superficial thing, which is a no no! It sends misconception to viewers, that's sad :( All in all I think one will enjoy watching this especially if you're musically inclined and into idols of some sort because it gives a light feeling. It'll still get you hooked at some point :)Especially the development of Lee Sin and Gyu Won's love story. That made me stick until the end haha Because I like their love team so much! I hope I was helpful enough for you. Thanks!