I started with high expectations but I was really disappointed. It was cute but there was nothing more to it. The story would have been very good but it was badly executed and badly written so in the end it's just boring, I've mostly watched it while doing something else.

The main plot is supposed to be revenge (I mean the main lead is literaly named revenge) but in the end it was mainly focused on the love story between the two main leads and the revenge is just put aside until the last few episodes. After the first 10 to 12 episodes, the story just drags on and on. It's a passable teen drama and maybe I'm getting too old to enjoy it, but overall it's way too cringy that it's hard to watch without wanting to throw away your computer. What bothered me the most is that they're adults but they constantly act as if they were 15.
The plot also included a sort of criticism of the Korean system of education with two characters close to the burn out, but they just mention it sometimes without really getting into the subject, which is a pity.

The great thing about this drama is the cast. All actors are very good in their own roles. Yoo Seungho has nothing more to prove, we all know he's a good actor, Jo Boah is also very good even though her character is sometimes very annoying, and Kwak Dongyeon is stunning as a villain.