Koji went on to play Storm Shadow in Snake Eyes (2021) and Yuichi "The Father" Kimura in Bullet Train (2022).
[2] He subsequently worked in Japan's film industry for a few years, before returning to England to train at the Actors' Temple Studio in London.
His agent and his mother convinced him to submit an audition tape for the lead role of Ah Sahm in the Cinemax series Warrior, which he secured.
[5][6] Based on an original idea by Bruce Lee for the 1972 series Kung Fu, that starred David Carradine, and was produced by filmmaker Justin Lin, Warrior is centered around a martial arts prodigy in the late 1870s who emigrates from China to America in search of his sister, only to be drawn into the Tong Wars of San Francisco.
In 2023, he appeared in the action-fantasy film Boy Kills World, directed by Moritz Mohr,[12][13] and joined Netflix series Black Doves.