Now here is a movie that comes way more than it was advertised. Generally, it is an easily likable story with just the right amount of surprises and twists. It is a flawed in technicalities but is easy to the eyes and the heart.

What I liked?
Jang Geun Suk (mainly)... :D
I watched this movie with no high expectation given its plot and the synopsis that almost sold everything for me. But I ended it with more than what I bargained for. I was blind sided by that twist in the end but it was very refreshing and is truly satisfying even though it doesn't make sense!

One Word: "Friendship"

Tis movie is jam packed with great chemistry, Main Lead to his Father, Main Lead to his teacher, main Lead to his Friends, main Lead to the Baby. You'll find it oddly satisfying that the main lead has no chemistry at all to the leading lady - which we all know is one of the foundation of a good show. But this movie is not about love interest between a woman and a man, it is between a person and his perspective.

you'll be surprise by how well they handled a very sensitive subject "Teenage Parenthood" in a very light and uplifting manner that will surely give you a smile and a heartwarming feeling as it ends.

What I don't like?

False advertising!
main lead was advertised to be popular with girls and is a trouble maker. Trouble maker - Sure, handled appropriately. Popular with Girls? Jang Geun Suk is perfect for that part, but there is no part at all. the entire movie shows ONE single girl on his heels all the time. Sure there was a scene that involves a lot of girls/women but it felt too awkward and is for compliance sake only. Technically, this movie failed to develop the character of the main lead form the beginning, may have succeed mid section of the movie but totally ruined it for the end though.

Flaws Flaws Flaws and a lot of Flaws.
Talk about cinematography, effects, vocals and a lot of loopholes.
First minute into the movie I saw poor editing left and right that i had to pause collect myself and back at it again. What flaws am I talking about?
to say one thing that is too obvious? - they used a stunt man that is too far from Jang Geun Suk's body built. The scene where the main leads are going to meet is one of the first glaring flaw I found. The stunt man on the big bike is double of Geun Suk's built, they are wearing the same clothing obviously and the size is just too far from the main lead. The flaw is just to bright that I cant ignore, because the main lead is wearing a perfectly fit grey slacks but the man on the bike wore a loose fitting grey slacks and the editing is done poorly to hide the fact.

They shouldn't have added voice over to the baby. It was weird having that old rugged voice used for a cute baby. it just ruined the mood for me

Alot of loopholes, a lot of questions here and there and only a few were answered at the end of the movie.

Recommendation:
With all the given flaws of this movie,, would I still recommend it for you to watch?
Definitely a YES!
Surprised? well it is because it is on a league of its own. while it was a movie obviously made because of the fad among Korean series about high school drama, it tackles about the worst case scenario in the lives of senior high school students, parenthood and friendship. It will come short and lack firepower to be a high octane comedy-drama that it definitely has the potential to become, but it definitely is undeserving of the box in the attic with dusts and molds.

You'll be surprised that given its flaws and loopholes, you'll end up liking the movie as it is and not only because of its main lead.