Humans are divided into alpha, beta, and omega. Alphas have always been in power, they have been strong and dominant. Beta people are the most. Omega people were weak by nature and very submissive. Normally, beta people would pair with other beta people, and alpha people would pair with omega people. Arlecchino was an omega. But she hated her nature because she didn't want to be obedient and submissive. Therefore, she avoided alphas and did not tell anyone that she was an omega.