Earlier, we reported that Karthi is collaborating with filmmaker Raju Murugan for an upcoming film titled Japan. The latest speculations suggest that the upcoming film will be a heist thriller, and Karthi is said to play a dual role. The buzz also notes that the film may release for Diwali 2023. 

The upcoming project marks Karthi's 25th film. Dream Warrior Pictures, which produced Joker, is bankrolling Japan as well. The banner has backed Karthi’s previous films like Saguni, Kashmora, Theeran Adhigaram Ondru, Kaithi and Sultan. Japan has Anu Emmanuel playing the female lead. Actor Sunil, who predominantly works in Telugu films, will also be part of Japan's cast, along with cinematographer-director Vijay Milton. The music of Japan will be composed by GV Prakash Kumar, while Philomin Raj will be handling the edits. Ravi Varman and Vinesh Banglan are the cinematographer and production designer, respectively.