Nhaaaa it's not like that. This will be spoiler for chapter 1597:
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Kiyoung transmigrate into a body of murim world. The person he transmigrate into who shared the same wavelength as kiyoung were a pregnant woman and almost die while trying to give birth. When kiyoungs soul transfer into the body,he experienced pain and realize the body he is in rn were giving birth.
He took care of the baby until he's like 8 yo and meanwhile looked around for the baby's father. The father were Jin cheong yeon. It's not Jin Qing but just someone who have same wavelength as Jin Qing does and Jin Qing who followed kiyoung into the murim world hopped into that Jin cheong yeons body when it almost die too.
So now Jin Qing and kiyoung were living together while also taking care of kkomuli the child. The child have heroic (or prolly higher) status and are very intelligent. Kkomuli have similar personality with Hayan and hyunsung where he always cry and very attached to kiyoung.
Why did they make you looks so… submissive and breedable