In the ABO world, Lu Yuhuai was accidentally transformed into an Omega. At the age of 18, he was arranged to marry an Alpha he had never met (set to have a susceptible period every month after the separation at 16 years old). In order to control the marriage, he went to a bar with Lin Yiqin...
Lu Yuhuai was humiliated and was rescued by his Alpha...
Concept: Characters repel each other, pheromones attract each other