Whoever uploaded this should be banned from uploading again, total disjointed garbage. This actually does have a good ending, I guess?
The coworker didn't set him up, the omega was mistaken for another omega participating in a BDSM publicplay scenario. The raws are available in burmese and this upload only covers the content of chapters 1-3. The brown haired guy saves the omega from the group of alphas and helps him deal with his heat. Still a trash plot, and assault for the sake of it.
Apparently this author has written other things that are good, so this is confusing. I guess some authors can't help themselves from writing r*pe.