Of course it's my own perception, but as pedagogue I won't advice you to watch Extracurricular.
Youth dating for money, robbery, emotional and psychic pain and school youth bullying eachother are a daily reality all over the world. Perhaps a point of discussion in the Korean society, always good to discuss these thema's but I don't need to see that in a K-drama.
I'm a happy and positive person otherwise I would be tent to get in a depression. I was really happen to finish this K-drama, so I could start a new one and forget Extracurricular.

Definately not my cup tea, an average 6 is far to much.