When an unknown country sends a dangerous spy to infiltrate China using an advanced coded communication system known as “Purple Secret,” the government can’t seem to crack the code. Dang Zheng, deputy director of the government’s special decoding department called Unit 701, goes on a recruiting mission to find the brightest talents that can help the country fight back against the proliferating evil spy network. Autistic math genius Rong Jinzhen (Cheney Chen) is forced to give up his academic pursuits when he is recruited into Unit 701, working alongside the beautiful cryptographer Di Li (Ying Er).
