An inspiring movie about never giving up, not even in the darkest moments.

Story
It's simple even if it sounds cliche.
The story is fast, something is happening every moment and it's like that from the beginning to the end, you could say there is no time to breathe.
Unfair things happen, you feel sad for the characters but since they never give up, you cheer for them and feel happy when they succeed.
Woo Sol reminds me of anime characters who always get up after getting beaten to pulp. It makes you think how many lives does this dude have.
The story is simple, he goes to prison, people want to beat him up, he trains, fights, wins, fights again, wins again, fights again, wins and that's how it goes to the end of the movie.
It's pretty straightforward.
I liked the story and characters but I always felt something is missing and I don't know what that is.
Maybe the movie should have been longer, maybe the characters should have been explored more. I don't know.
The villain was awful and I hated him, he played the victim when it was benefiting for him even though he destroyed other people's lives. He had no remorse.
I don't know if he ever regretted his actions.
He literally got stabbed in the eye. If that didn't open his eyes, I don't what will.
Do Hyun was a cool character, a mentor and a friend Woo Sol needed. He didn't appear much but his influence was big.
If there is a second movie, I will definitely watch it because I want to know what happens with the characters.

The quote that sums up the whole movie.
"You know sharks?
They don't have swim bladders so if they stop swimming, they sink and die. That's why they keep moving. You are the same."