This is a non-shifter ABO series in which humans evolved from canidae rather than primates, and are classified A/B/O as their primary sex at birth. Elements like heat, ruts and claiming marks are retained, mpreg is possible once an omega is mated, and while there is no furry action, younger characters may be referred to as pups.
Open relationships exist within SJ, which means Kyuyehyuk will engage in non-romantic sexual encounters with other members throughout the story. There is no cheating involved, and everything that happens among the sujus is consensual.
Characters may make morally ambiguous decisions throughout the fic. Everyone is fucked up in some way, so I recommend you approach this fic with an open mind unrestricted by your knowledge of our world to enjoy it to its full potential. Stay safe and happy reading!