Responses
(SPOILER)
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The emperor will reveal that he knew about him pretending to be his sister the whole time around chapter 70. The sister will also come back much later (after chapter 100)--she's super supportive and protective of her brother.
I'm on chapter 58 it's a good story but I wanna know does he ever find out that chengfong is actually changfeng and if so what chapter also how does the sister react to this cuz it seems like they completely forgotten about her