An attractive playboy and Nationalist spy, he is the son of a military leader and develops a close bond with Rosalind when they are paired for a mission.

A teenage Russian Communist agent with a history intertwined with Rosalind; works on a surveillance mission in Shanghai’s media scene.

Orion’s precocious teenage sister who often involves herself in his spying activities and uncovers vital information with her partner, Silas.

A young spy and double agent, known for his devotion to Phoebe and his role in supporting her espionage efforts.

Rosalind’s younger sister, who identifies as female and works with the Communists, balances her loyalty between her sister and her partner, Oliver.

Orion's elder brother and a Communist agent, who distrusts his family and is involved in secretive operations against the backdrop of political upheaval.

Rosalind’s handler and father figure within the Nationalist party, with deep experience in espionage and training assassins.

The grandmotherly owner of Rosalind’s apartment building who is also a Nationalist agent, capable of brewing antidotes and supportive of Rosalind.

Orion and Oliver’s father, whose trial for treason casts a shadow over the family and whose actions have lasting political consequences.

A scientist and Orion’s mother, she is involved in chemical experiments aimed at developing an army of super-soldiers with shifting political allegiances.

A file clerk and Rosalind’s boss at Seagreen Press, who becomes her new handler after the departure of Dao Feng, prioritizing Nationalist party loyalty.