‘Ro Jaeho' and 'Joo Ian' are the sons of Alpha families who are sworn enemies. However, their little brothers 'Joo Jihwan' and 'Ro Miho' are in a relationship...? Ian joins Miho and Jihwan's holiday in America and meets Jaeho there by chance. There is a strange tension in the air between the two older brothers... "Joo Ian, you... You didn't use to smell like that before!"