aight imma finally ask help for this, please thank youu T~T

So, I remembered reading this 4 years ago on a manga app, it was still starting at that time. It’s sci-fi I think.

The gist of the story is mc (a male) is basically a product of an experiment. Like test tube baby, genetically modified etc. But he doesn’t know that. He was made to be perfect in every way. He is described to have very beautiful eyes, like the eye color. He has black hair. And he is a student in an elite school and is popular. I remember there was a part where he and some other guy were competing for a horse race. And their horses were black and white, the other horse was named kuro, I think.Then, he was able to discover about the test tube, genetics thing because he found the lab and all, then he gained some lost memories, I think. And, if my memory serves me right, he stabbed someone or he gets stabbed, either or.