A story of self-development physically and mentally, laced with family bonds and ... fueled by revenge? A rather strange but interesting mix that creates an interesting, compelling and in a way heartwarming story.

Story:
The plot focuses on a salaryman, that decides to take a revenge on a high-schooler who had assaulted his daughter. At this very moment, one might wonder is that a grown man's reaction and is revenge really the answer, however, we do have to take in account father's love towards his only daughter, that plays a large role as his motivation.
Through various different training ways, with the help of 3 high-school boys, he not only reveals his physical potential but also changes his view on life and starts changing his personality to a more brave and decisive man, rather than a coward he was before. It's a journey that usually a young man would go on, but here a middle-aged office worker takes this serious step in order to defend his daughter's honor.
Apart from the main plotline which eventually leads to the final "fight", there are several small side plots, stories of people directly around him that either has gone through this road themselves or are actually inspired by him to try and improve themselves. It also touches upon the back-story of one of the boys helping him, adding a twist of father-son relationship building between them, which adds another layer to the movies base - family.
The small additions of the side plot were nice and so was the actions repeating themselves and showing the development of the character, yet one could argue it might have been too repetitive and, perhaps, a bit slow paced. The motivation for 'revenge' is questionable as well, but the focus on family makes the viewer forget about it while watching.

Acting/Cast:
Not much can be said about the side character, as their involvement and presence is very minor throughout the whole movie. The main characters played by Lee JoonGi and Lee MoonShik are very interesting and actually complex, however, the fact this is a movie does not give us as much insight on either of them as we would want. It gives glimpses and narrated backstories (Lee JoonGi's character) or a narration over ongoing action (Lee MoonShik's character), however, it feels more could be known about them. That being said, both actors did a splendid job with what was given to them!

Music
Tunes from the time when the movie was made and even early, mostly focusing on the theme of the movie in the lyrics, enhance both the main thought behind the movie as well. The chosen singers, songs and lyrics all tie together with the story. But would this be a soundtrack we would search for to listen to daily? Probably not.

Over-all, the movie was an easy watch and it didn't feel like it was dragging on for too long. Yet if I have to admit I probably am watching it only one time, the plot not being something one wants to watch over and over again. I would recommend it for a one time watch.