Responses
From what I understand in my own way, I think Tougo got hurt for not being recognized by Tsukasa whom he become friends with when they were still in the orphanage. Tougo suffered alot back then when Tsukasa wasnt around anymore after he got adopted. After so much suffering and hurtful days, Tougo discovered that he was neither an Alpha nor Omega but an Enigma. He uses his powers(? .. Is it powers or ability? Whatevs ) to get revenge and be love by Tsukasa and/or be happy and have a happy relation like they have in the past when they were young.
I still don't understand why the enigma guy hates the "previously alpha but now omega" guy so much? Why does he have to take revenge for something petty? Or maybe this was really a misunderstanding? Idk I'm confused here I mean move on man!!!