Super Junior's Siwon will be returning to the Chinese big screen for the first time in 7 years!

He's currently filming the movie 'Helios' in China and Hong Kong, and actor Ji Jin Hee is also cast in the film. 'Helios' is a movie that deals with Korea's developing nuclear weapon being stolen by terrorists. Siwon plays a policeman who chases the terrorist, and Ji Jin Hee plays a Korean scientist. 

Wang Xueqi and Jacky Cheung will also star in the movie.