The main couple is alpha x omega but the second one is alpha x beta, personally I really like the second one more
https://www.mangago.me/read-manga/kashikomarimashita_destiny/
My fav
Exclusive No-Love Zone
Do u know what chapter the side couple are in?
It starts to build from chapter 4, but I recommend you to read it all to get the whole story(๑•ㅂ•)و✧
"Oblivious Mr. B" I am technically spoiling it but basically an alpha pretends to be an omega in order to catch the beta MC's interest. It's beta x alpha though!
pls recommend some alpha x beta stories, it's so rare i can't find one