Reversal of the Twist of the Inversion

"I'm pregnant, and I'd like to marry him."
Seoho decides to suddenly arrange a marriage with a man he claims to have had a baby with.
He introduces a man who turns out to be Ko Eunhyun, an alpha and the wealthy son of a famous hotel's chaebol family.
In reality, they had only met yesterday in an one-night stand,
but who cares about the little details!