Boring and formulaic story. The dialogues are plain and very poorly written, whilst the relationships between the main characters lack any kind of chemistry. That makes actually caring for the characters very difficult, and the perfomances do not help either.
The show's popularity that made it cross frontiers with several remakes is a vivid proof of how audiences are so easily trapped with cheap dramas, and it can't get any cheaper than a story about kids with cancer.
With some wit, you could even use this overused plotline to tell an interesting story about growing with a difficult medical condition and learning to overcome these circunstances, however the lack of charisma from the characters can't help but to make this another formulaic story about cancer that is not worth your time. Visiting actual children hospitals would be a better and more gratifying experience than watching this.