Responses
Pittman probably has some type of trauma with male omegas. His father who gave birth to him is an omega who has been marked by more than one alpha.
So his father who gave birth to him is always trying to escape from his various alphas and making trouble. I really wanted a story from him (▰˘◡˘▰)
In this story many alphas can mark the same omega. But an alpha can only mark one omega (I love this inversion compared to other omegaverses).

I want to share some of my observations regarding this webtoon before reacting over the actual story;
First, the pacing is too fast. Scenes aren't fleshed out well or depicted in a way that helps readers enjoy what is happening.
Second, there is poor world building in this story. I can't seem to grasp or get into the story as much because I don't really know what Mr. Pittman's job is, yeah he's a CEO.... Of what? Who is the blonde guy friend who seems to know how the uke feels? What is this weird switch in Mr. Pittman's attitude and the secretary, one moment they're so formal and you wouldn't really feel the sexual tension between them, but then the next scene he sexually assaults the secretary... ( ̄へ ̄)
Also, is mr. Pittman a homophobic closeted gay? Cause the only reason I could think of why he doesn't want to bed the secretary is the fact that he's a man and mr pittman is homophobic despite having feelings for the secretary.