This is based in a alpha/beta/omega world.
Omeganite: Omega shadowhunters trained for the purpose of pleasing alphas and reproducing. Male shadowhunter omegas have angel wings and are very rare.
At the age of 13, Alec never thought that he would be presenting as a omega, and when his father finds out his true gender he gets sent to the omeganite academy. This story is set before Alec meets magnus.