I just finished the series.It's an amazing series.I have started falling in love with Spanish drama.I don't know why some "highly philosophical and intellectual people" are criticizing this series but if you are into high school thrill then you would totally go for it.
Spoiler alert:
I can't understand why people are seeing Raul as a negative character.Someone who would take care of a person going through a mental breakdown can't be a negative character.Though his way of taking revenge was weird but taking revenge of your fake friends is pretty cool as having fake friends is way worse than being alone..