Alpha Young-han and Beta Min-jae are set to become a family through their respective parents’ romantic relationship.

Young-han, who has gone to buy cold medicine whilst acting as an older brother to the trouble-prone Min-jae, is confronted by Min-jae’s sudden Omega manifestation.

Losing his senses, Min-jae throws himself at Young-han, an Alpha. Young-han tries to flee, but he cannot escape Min-jae’s pheromones…

The two of them end up getting into trouble.