• Both have this 'revenging for others' thing going on and because of that this drama reminded me of taxi driver a lot.
• Both dramas have main characters with their _realistic_ life problems and stories some people might relate to.
• Both dramas discuss some 'darker' themes like bullying, suic!de and sexual assault.

There's also lots of differences between the two but i would say that this drama would definitely be interesting to watch if you liked revenge of others.