JOINT Ending Explained [SPOILER!]

SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!

SPOILERS AHEAD

JOINT Plot Summary and Synopsis

After serving 2 years in prison, ISHIGAMI Takeshi (YAMAMOTO Yikken) spent two years working on a construction site and building up his funds before he returned to Tokyo with the help of Yasu, his best friend. He is determined to try and go straight but before he can do that, he has to raise even more money to break free of the criminal underworld and that requires a deep dive. He enlists his Korean friend Junghi and starts a business selling data for phone fraud to his Yakuza friend Yuki. As the business grows, Takeshi can just about make escape velocity, however, his old ties are holding him back and as a split in a yakuza family signals that start of a war, Takeshi finds himself getting dragged back down to the criminal underworld.

Source: Wikipedia (CC BY-SA 3.0).