Father/Son/Mentor drama...

Hi, I don't know if someone already posted a thread like this...well, I couldn't find one, so I'm making a new one.

I'm searching for a drama/movie (preferably Korean or Japanese. Chinese or something else only if it is really amazing) which has a really strong and interesting father/son relationship in it. They don't have to be related by blood, so it can also be like a mentoring relationship.

I'm also open to a drama/movie about with two brothers or two brotherlike figures. A drama where they look out for each other and help each other out.
As for other genres of the drama, I'm open to anything :D 

A really good example would be City Hunter; Bitter Blood; Dream;The Gifted Hands; Secretly, Greatly
It would be great if someone knew a drama like this XD 

Time Between Dog and Wolf

I second Ugly Alert~ it's very good! 
Tonbi - the heartwarming relationship between a father and his son
Kazoku Game - a teacher who is kind of a mentor to his student
The Painter of the Wind - it's about a mentor and his student (with a bit of romantic feelings)
Welcome to Fortune-Telling Onmyo Shop - again, contains some kind of mentor-student relationship
Tokyo DOGS - the main leads are like 2 brothers and they have this kind of love-hate relationship
Protect the Boss - again, the male leads seem to have a love-hate relationship
Pin to Kona - the male leads are both rivals and friends
Kids - it's a movie, but both of the main characters seem like brothers
Fallen Angel - 3 brothers who try to help each other

Sorry for giving you mostly japanese recommendations :")