The acting was great, with lots of tearjerking moments. The child actors also did a good job.
I think the drama did well with the topic of bullying and how distressing it can be for the victim and their loved ones. On the negative side, this did not have to be 16 episodes long with a one-hour format. In the middle the story started to circle and got a bit tiring. The use of the main theme sound was too repetitive, I would have preferred an instrumental one.

This doesn't have a good rewatch value. For a 2nd time, you'll have to skip around to enjoy the gripping bits of the story again.