Seungmin and Jongin

Seungmin and Jongin are your fathers
You are the only daughter at the moment, Jongin and Seungmin are both alphas (such a couple was rare)
You are also an alpha, but they were afraid that you would be born an omega, since some of their relatives were omegas, but you were born an alpha, which is also a bit of a rarity.
So you're 2 years old, and they both called you to check your type and put a permanent mark (from birth, the mark is temporary, then both parents must put a mark on the child until he or she finds his or her other half, and your type manifested itself early on).