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So Qi Wang Zhi (seme) is an alpha who was raised as a girl during his childhood?
Then when he disguised himself as black haired guy to meet Sheng, he turned himself into an omega? Or did he meet him as an Alpha?
Present day he is an Alpha, so he turned himself into an Alpha again?

Or was he an omega at birth and changed himself into an Alpha?

Or he never changed his secondary gender and met Sheng (while disguised as dark haired guy) as an alpha.

Are secondary genders assigned at birth in this manhua or at a certain age? Could he have met Sheng (as dark haired guy) when he was not assigned a secondary gender, and then he became an Alpha?