Once Upon a Time in Shanghai (2013)

Lots of fight. Lots of good fight and bad fights. Gang fights. Complicated fight. Sacrify for the love one. Conditional fights. Revenge, justice

Great action, anguish, and greatness. Both involve fighting off Japanese influence as well

Both has ring fight. Chinese one more kung fu martial art, Korean one more like wrestling. Both were underground bloody, money involved, illegal fight

Both has ring fight. Martial, boxing, skill, fast pace fight. Brotherly on Chinese one, Sisterly on Jap one. Both deal with illegal ring fight.

Andy Oh is in both movies.
Lots of action, kung fu fist fight
Some romance, maybe more then some
Old movies

Both movie involved main lead in the ring fight.
Lots of action
Both has romance
Love triangle
There are solve side of a tough man

Both film has lots of action, fist fight,
One of the male lead is very attractive, handsome.
Some plot twist, friendship, tough fight

Both movies has two male leads. One has lots of martial arts, fist fight, and action. The other one one male lead whose from HK ended up work for the dark side to support the family.

Both movies about old time enemy become friends.
Friends that can’t be together.
Hardship, war time, bromance,
About war, fighting, action, intense.