It's a lightweight school drama and is really easy to watch because 1) it's not too long with it's bite size 11 episodes which is around 30 minutes each, 2) the casts matches the age of a high schooler, 3) the concept is simple. In this short drama it addresses a lot of issues and ideas like bullying, sexual harassment, mental issue, relationships, family and many more.

I'll be honest, this drama is filled with eye candies so it's really hard not to love it. Cha EunWoo, Park Solomon and even Ji GunWoo isn't too bad himself. Just seeing them on screen makes me smile right away (sorry for the fangirling commercial) but also at the same time, the storyline is also intriguing enough for me to keep watching it. Although I understand some people might not like that this series is not as detailed as most dramas. It doesn't show how the 'revenge' really happens or who does it. It feels more of like a magic wherein after the name is entered, a revenge is being acted upon.
(Although there were also lot of hints that points out that it was GoHee's brother, Heo GoJoon is the Revenge Note master.)

It also ended in a rush making you feel like wanting more episodes. There were lots of loose ends. Like what happens to the suspicions of AhJoon regarding the notification he received, I thought he's a hacker so I was thinking he could be more. Also, Cha EunWoo disappeared after GoHee's birthday and there wasn't even a proper wrap as to what happened to him. Who was really the Master and how did he/she ended up making the Revenge Note?

Despite all the questions left, this web drama series is worth-bingeing. It won't even take up a day to finish it. This is highly recommended. It would actually be good as well if you can share the assumptions and theories you formulated after this drama.