This series took me a while to finish, as I don't generally watch these type of slow, slice of life type of dramas.
With that in mind, let me say what I thought this got both wrong and right.
First of all, this is obviously based off the hit 2009 Zach Efron movie (which I really liked I might add). Enough time has passed that this felt like a fresh take on the idea. The first two episodes are like a carbon-copy remake in Korean, and then it moves into original territory. The show takes a more serious look at the base story, focusing on Dae-Young's relationships with his wife and children. The comedic aspects of the movie are almost completely traded in for a more morose and poignant tone, and for the most part this is actually a very good thing. I liked the way the show examined marriage and parenting and how Dae-Young was able to re-evaluate his life from the perspective of an 18 year old. There was a lot of closure for side characters that were totally blown off in the movie, and I really liked that they decided to get rid of the super cringey part of the 2009 movie where his daughter fell in love with him - wow did I hate that part!
This show also had a really great soundtrack, with some stand out heart breaker songs and some beautiful piano scores.
What this got wrong though is it really was too long in my opinion. The story could have been told in half the episodes, at the most 10.
Overall this is a sweet and serious story that was really pushed through by Lee Do Hyun as the breakout star of this - while I have seen him in almost every thing else he has been in, this is his first main role, and boy does he shine! If slice of life/school/relationship drama's are your thing I think you should definitely give this a try!