Title: Love is an Illusion!
Hye-sung is an alpha. Er, or at least he thinks he is an alpha. However, that belief quickly goes down the drain while Hye-sung is working at a party and runs into the dominant alpha and musician, Dojin. After being exposed to Dojin's pheromones, Hye-sung goes into heat. Dojin tries to take care of Hye-sung and save him from himself as the newly awakened omega tries to throw himself on a few alphas. Dojin whisks Hye-sung away to a hotel where Hye-sung rants and raves that there is no way he could be an omega. Finally, Dojin, flustered by Hye-sung's pheromones and frustrated by Hye-sung's delusional beliefs, proves to Hye-sung that he is indeed an omega… physically.
After the dirty deed, Dojin realizes that he actually enjoyed it even though he supposedly hates omegas because of the notion that omegas and alphas have to be together. Even more distressing is that Dojin follows up their encounter by writing a song that his peers say is his best work yet. Believing it is just a coincidence, he runs into Hye-sung again, and they have another steamy encounter that not only results in another great song but something neither of them expects: a baby.
Hye-sung wants to get rid of the baby while Dojin intends to keep it, but more importantly, he now desperately wants to hang on to Hye-sung. They make a deal together where Dojin will pay Hye-sung to carry the baby to term, and Dojin will assume full parental responsibilities. Hye-sung will finally be financially comfortable, and he won't have to be a mother. Still, Dojin plans on doing anything he can to talk Hye-sung into raising their baby together. The problem is he only has the span of Hye-sung's pregnancy to do it.