In a world dominated by a collective virus, the two viruses split within the same population of Earth. In a world dominated by a collective virus, the two viruses split among all the inhabitants of the earth.

Where half the planet became of his species Where half the planet became of his species A Those with blood type A are called "Rin." A powerful virus develops within them, and any exertion that causes adrenaline makes them feel like they have an aphrodisiac effect. Therefore, they need the other half of the Earth's population, those with blood type B, to help them.

Half of the world's population with blood type B also carries the virus, but it makes them more vulnerable compared to those with blood type A. Half of the world's population with blood type B also carries a virus, but it makes them more fragile than those with blood type A, because those with blood type A possess greater strength than the fragile human strength of those with blood type B.

Scientists have developed specific methods to prevent promiscuity, so they created a special sedative injection for people with blood type A. Scientists have developed specific experiments to prevent promiscuity, so they created a special sedative injection for people with blood type A. However, the problem is that they are attracted to the scent of people with blood type B, especially one person with that blood type.

Another problem is that those with blood type B Another problem is that people with blood type B may die if they don't receive a vaccine from someone with blood type A. Therefore, scientists developed a sedative injection for people with blood type A until those with blood type B reach at old ideally up to 25, so they can marry and complete the process.

The deal = is to calm down a blood type A person when their adrenaline surges by kissing and then having with their blood type B partner. The deal = is to calm the type of blood A person when the adrenaline surges by kissing and then having with their partner who has type B blood, where the type B person takes a little of their partner's blood to eliminate the virus so they don't die. The same applies to those with blood type A, but they don't die from the virus when the adrenaline subsides with continuous kissing, even if they have while constantly kissing.

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You and your brother, whose blood type is B, were born, and your older brother is already married to a woman with blood type A.

And now you have been chosen to marry Taehyung, who has blood type A, and who is addicted to your scent, always watching you like a ghost, protecting you, and possessing you like any other blood type A partner

But your brother's wife wouldn't do that to your brother because she's a woman.

Finally, those with blood type A are called "Rin," while those with blood type B are called "Ben."