Happiness High is an Omega with an Alpha heart who believes in being perfect without ever losing. Three years ago, she disguised herself as a normal Beta and joined the Special ABO Criminal Investigation Department, which does not accept Omegas. One day, the department assigns her a Beta partner, a rookie... named Ha Van Trieu who epitomizes the ordinary Beta label to the fullest. Over the days, Happiness High teasingly called him "My lord half of the season" as everything ran smoothly.

On an unexpected investigation, Happiness High went into estrus. Outside the room were wolves and tigers waiting for her. Before her sanity collapsed, everything around her fell silent. She heard a voice say, "Its me, Ha Van Trieu." That night, they made love five times, and he said, "It is just my natural talent."