Xu Fan is the perfect Alpha in everyone's eyes - the president of the student council, with top grades, rationality and restraint, and even the top button of his shirt is meticulously fastened.
Xu Yun is a popular figure on campus, the ace of the basketball team, unbridled and flamboyant, and his pheromones carry an aggressive scent of cedar. No one knows that he is actually a once-in-a-century **Enigma**, a dangerous existence that can rewrite Alpha's gender.
They are fraternal twins, yet more alienated than strangers.
Until Xu Pan discovered his younger brother's secret in the medical examination file, until Xu Yun lost control and bit his fingertips during the susceptible period, until those childhood memories that had been deliberately forgotten gradually emerged——
**"Are we really 'brothers'?"**
When the campus forum revealed their "unethical love", when his father forcibly sent Xu Pan abroad, when Xu Yun's pheromone system was on the verge of collapse due to separation...
This genetic conspiracy that started in the laboratory will end in the most immoral way.
Purpose: Under the triple constraints of genes, ethics and social rules, human beings still have the right to define their own love.