This is gonna be my all-time-favorite Drama.
I enjoyed every episode. There were just 2 episode that were a little bit boring but the rest was absolutely awesome. The acting, OST, storyline, chemistry, everything was flawless.
The performances of the kids were great. It's hard to believe that this was Kang Chan Hee's debut (young Dong Joo). He was so natural in his acting.
I was surprised by Hwang Jung Eum. This actress would be a major reason to not watch this show. But I am glad that I decided to watch this. I really hated her in "Giant". Her acting was so annoying (facial expression, speech, everything). But that was not the case with "Can you hear my heart". She portrayed Bong Woo Ri well, so that I forgot that she is an actress I actually can't stand. She was so funny and adorable.

The bromance in this drama was funny. Kim Jae Won and Nam Goong Min sure have a great chemistry. I loved their relationship.
There are usually at least one character that I dislike in a Drama, because this character is annoying or whatever. But that's not the case here. Each character was well portrayed and you could see that each character was well developed.
This is indeed a masterpiece that I recommend to everyone who wants to watch a Drama which has a plot with a deep meaning.