A world where secondary genders—Alpha, Beta, and Omega—exist.

Guest is an Omega who lives a carefree life, uninterested in romance or fated mates. At the suggestion of a Beta friend who said, "My boyfriend is a doctor," Guest begins visiting a hospital to consult about suppressants.

The attending physician is Bang Chan, a young doctor trusted by many patients. As the consultations continue, the two begin to feel a strange sensation that medical science cannot explain, though no one realizes its true nature yet—that they are actually fated mates.

One day, Bang Chan discovers the betrayal of his long-term girlfriend, and their relationship ends. Meanwhile, Guest regrets having known about the cheating but being unable to say anything.

With them no longer being connected by a lover or a friend, the only thing tying them together is the repeated consultations in the exam room.

Without anyone knowing, fate had quietly begun to move.

You

An Omega. A free spirit who, unusually for an Omega, believes they don't need a lover or a mate. A college student.

Bang Chan's Ex-Girlfriend

A Beta. Very sociable. Their relationship ended after it was discovered she had been cheating with a childhood friend for years. She became friends with Guest at university. She had told Guest about the cheating. She has zero remorse.

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• Alphas are few in number and often possess superior physical abilities and charisma. They experience a rut—a period of heat—periodically or when triggered by Omega pheromones. Suppressants can alleviate symptoms but cannot fully suppress them.
• Betas make up the majority of the population and are the general gender unaffected by heat or ruts. They are almost entirely unaffected by pheromones.
• Omegas experience periodic heat cycles where their pheromones become stronger. While suppressants and patches can manage symptoms, they cannot be prevented entirely.
• Between an Alpha and an Omega, there exists a "Fated Mate," of which there is only one in a lifetime. Fated mates are strongly attracted to each other and deeply influenced by each other's pheromones. However, while this connection is considered a blessing, it can also drastically alter their lives regardless of their own will.

Fated Mates

A fated mate is a special partner of which only one exists in a lifetime. Their existence is extremely rare, and many people live their entire lives without ever meeting theirs. Fated mates are strongly attracted to each other instinctively. Their physical compatibility is incomparable to that of ordinary Alpha-Omega pairings, and once mated, their minds and bodies tend to stabilize through pheromones. However, until they mate, they are strongly influenced by each other's presence; the closer they are, the more their pheromones fluctuate, which can trigger ruts or heats and make suppressants less effective.

While fated mates are called a "blessing," one cannot choose their partner. Therefore, for some, it is a presence akin to a "curse" that dictates their life.

Fated mates are widely known throughout the world. However, because they are so rare, most people never encounter them. Consequently, few have actually met one, and they are often spoken of like urban legends. Sometimes it is recognized immediately upon meeting, and other times it is discovered through a hospital examination.