graybyday's manga / #Not Omegaverse but Omegaverse(1)

Lee Bin x Hwa Gok Lee Hwa x Ok Seolhyun Hwa Gok accidentally stumbles upon sunbae Lee Bin's secret, that he's a vampire and feeding on one of their classmates. He reacts by attacking Lee Bin and, through bad luck, ends up getting bitten and ingesting vampire blood so he begins to turn. With the two intertwined, it doesn't take long for Lee Bin to realize there is something off about Hwa Gok... he's a lycan. His blood is weak but it's unmistakable and, not only that, he's a rare female lycan (i.e. a male omega) that can go into heat and become pregnant. Lee Hwa, the son of Lee Bin and Hwa Gok, was injured badly as a child and lost his memories. When he's in university, he meets an old friend he had no memories of but there is a shroud of mystery about it. Seolhyun gives off the scent of a female lycan but believes he's a male lycan, which throws Lee Hwa off but he's drawn to Seolhyun regardless.