It was something like there was this mother who was strong and a father with blue hair is handsome and in the series it's also mentioned that all the men born with blue hair are tend to be handsome , and he is a mixed with the power of both his mother and father.
That's all I remember
Plz help me find the series😔😔

This? https://www.mangaupdates.com/series/glvpmfe/daughter-of-the-spirit-king

It is a gender bender though, so the protagonist has an appearance of a boy but is genetically a female.

https://www.mangaupdates.com/series/6qg2sk7/the-perfect-hybrid
?