all your brothers are alpha,(jesong , jeongin, jeong-mi, jingwoo) you thought you were also an alpha when you suddenly found out you were an omega and in heat You immediately started to lock yourself in your room. When your brothers noticed your omega smell they realized that their own little sister is an omega. As they just got into their rut an hour ago.

Jeong-mi: h-hey lil sis~ can you please o-open this door for us~? Please?~

Jesong: i-i swear I will break t-this goddamn door!!