
no.... he legitimately doesn't know......
spoilers........................................................................
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In a few chapters (maybe next, I don't remember), Felix will claim that Benjamin is his son, but in the context of him planning to have Isaac move in with him, and therefore Benjamin too. He doesn't know that Benjamin is his actual son and he still thinks Isaac is a beta.
Ironically, his statement will cause the step father to realize that Isaac is an omega. (because apparently beta males could occasionally get pregnant, but only omega can give birth to alphas, and Benjamin is an obvious dominant alpha. don't take my word on the beta part since translations might be fucky at times) The step father will then proceed to force himself on to Isaac and try marking him. This is when Felix realizes that Isaac is an omega and overrides the mark since he is a more dominant alpha. Felix does not connect the dots on his own and only realizes that Benjamin is his biological son when Isaac tells him point blank

Thanks god. I don't want to read any rape scene again. at least i want to see Fleix beat the shit out of him for even touching Issac.
You know, I liked walk on water manhua a lot. but when I got that rape scene, i was freaking shocked and when i was scrolling down to read next page i was wishing so hard that the seme is gonna walk on them and punched that bastard, but no its never happened. I was damn angry and read till last to see a good beating fighting any scene to at least please my eyes, ease my mind. but no that also never happened. Ah my poor soul. (〒﹏〒)
If i would have payed attention to the comments section before, I wouldn't have to feel so disgusted even now just remembering the name.
So if I got this correctly, Felix actually KNOWS that Isaac was meant to kill him 4 years ago.. right? I mean how has he not yet put together the fact that Isaac's the omega he fucked at that time? I get that Isaac SAYS he's a beta and all, but with the scent that came through to Felix a few times and the baby being IDENTICAL to him... Maybe he's figured it out but he's waiting for Isaac to get Benjamin back before bringing it up?
Ugh these people are driving me mad.