In my opinion this is the best School series among 2015, 2017 and 2021.

The drama tells you about real life happenings, no too much drama compared 2015, mostly realistic than 2017 and doesn't focus on romance, but it doesn't mean they are that bad. There is a plot twist that aren't predictable and the actors are good in their roles, also I can relate almost all of the scenes.

This drama is the reason why I felt in love with Lee Jongsuk, his acting is pretty good as a rookie during that time same with Kim Woobin, Jang Nara and Choi Daniel, there is no doubt in their acting.

Overall, this is a good recommendation for starters and for younger audience.