I'm a Sub but I'm Pregnant?

A romance fanatic isekai'd into the first and last BL novel they ever read?! And as the villainous sub-gong, Lim Yu-hyun, who shares the same name. Starting with building a smooth relationship with the innocent main su, I tried to avoid the death ending, but my plans went awry. "You will naturally re-manifest as an omega." A bolt from the blue from the doctor. Me, a beta, turning into an omega? Despairing, I try to intentionally avoid the main gong, the catalyst for the transformation... "This is your last chance. If you're going to run away after the heat, stop now. I'm not going to let it slide anymore." As I try to avoid him, the main gong approaches me more and more, causing me ...