Brothers Woo-Joo and Han-Bit, who live happily under the same roof, have two secrets that are unknown to others. First, Woo-Joo and Han-Bit are not biological siblings. Second, Woo-Joo has been in love with Han-Bit for a long time. Then one day, when Woo-Joo suddenly emerged as an omega, a third secret was created between the two.... "Woo-Joo, you may not know it well when you are young, but it doesn't take love to mix bodies."