Detective Forge is set up as a foil for Netah, a By-the-Book Cop well-aware of his rampant corruption but forced to be his partner. And then she gets unceremoniously killed off in a car accident halfway through the second act without much fanfare, and is never mentioned again.
Feng Ling is established as a potential Big Bad, being responsible for Yo's brainwashing and ordering his death. Outside of flashbacks, she's never seen or mentioned again after her initial appearance.