[1] Directed by An Jian, it stars Cheney Chen, Ying Er, Jing Chao, Zhang Zhehan and Ady An.

[3] The series topped ratings chart and had over 6 billion views online during its domestic broadcast, but received mixed critical reviews.

A top-secret Chinese intelligence agency named Unit 701 was formed, whose sole purpose is devoted to cryptography.

There, he cracks the code purple, without knowing it was invented by his former teacher and best friend, who is actually a military intelligence analyst for Country X.

However, this is only the first of many betrayals that follow, and slowly Jinzhen unravels the secrets behind his mysterious past.