Sonny Kang

The murder of an Oakland gang member forces Cho to confront his murky past when he discovers that the victim was an old friend who is willing to go to extreme lengths to exact revenge.

A man is killed in what seems like a mugging gone wrong. Meanwhile, someone from Maura's past arrives, and causes tension between her and Jane.

A spy overhears Kim Brown talking about intimate details of the Unit's dangerous North Korean mission, jeopardising it.