Indeed, he's not outwardly evil. He's psychopathic, in the sense of his emotion processing is kinda blocked or smth. He couldn't understand or express emotion 'naturally', as you might have noticed he 'acted' as a response to others feelings. And it's slightly angsty because all Greyson want is to 'help', show his care, but his way of doing it is beyond moral
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https://x.com/ascension_tin/status/2034613425012093015
This was a good explanation on that convo about Bliss. The adaptation just lacks context and non novel readers mostly comprehended it straightforwardly. Hope you find time to check it. Author also recently clarified it.

I'm so confused with this manhwa, like I dunno but I don't see Greyson as a "bad" character at all but everyone keeps wanting to beat him up.... In the beginning people were pissed coz he sleeps around, then when he came to the fire station they wanted to all "teach him a lesson" by beating him up!??.... Then the thing with the being locked up with a kid, Dane saw that bro clearly suffers from something that was done to him.... He's never outwardly evil, not at all like any of the other Alpha's I've read about, but everyone just wants to beat him up because he's roaming the world basically confused....