The fake Chou Xue was detained and soon transferred back to the capital, personally escorted by Xu Wu, along with Gao Kang.
This Gao Kang was not a local, but someone who came from the Bay area. Right after setting foot on the mainland, he got targeted by the National Security Bureau.
However, he disappeared after a few days. After a fruitless search, people had to temporarily let it be, not expecting him to reappear within the capital's borders.
And this Gao Kang was not the real Gao Kang, but an impostor who took the place of the real one. The original Gao Kang was in the military; after serving for five years and being due for reassignment, he was approached and befriended by the fake Gao Kang on the way.
The fake Gao Kang took an interest when he learned that the real Gao Kang was an orphan planning to return alone to his family home.
So he killed the real Gao Kang and took his place in Huai County.