The owner of Nagaya Holdings used his power to cover up his son's crime, causing Shin to fall into despair. He then decides to take revenge on Nagaya Holdings, with his new goal to make the father and son of Nagaya Holding to pay for what they did.
A joint Japanese and Korean production, Roppongi Class is set to premiere this July, and will air every Thursday at 9pm JST on TV-Asahi. It will then be available online via TELASA in Japan. It is unknown if just like Itaewon Class, it will get an overseas release via Netflix.
[Source: Natalie, Asian Wiki]