This is honestly one of the best dramas I have ever seen. It's a mix of friendship, love, hate, jealousy, backbiters, corruption and most importantly the reality of today's high schools. The best part of this drama was how those friends came together and the way they overcame their individual problems.
It did feel weird when those parents were dating but I think at the end that was solved too when Yeol called his mother and asked her to adopt him and not break up with his girlfriend.
It was fun to watch and maybe I will watch it again.