Omega Bus Stop
TW rape in chapter 17 (by different couple, different stories)
Omega Complex
Summary: Childhood friends, beta uke, Lee Yoonwoo turns omega grow distance with Han Taegyeon (seme) because seme said he hates omega. After finishing his military enlistment, he went back to school and coincidentally met with the seme.
Bokutachi wa Unmei ni Kirawareteiru
This manga is rollercoaster thank God everyone got their happy ending TW: Sexual assault by uke's friends in ch2 Summary: Uke had a heat transition (beta to omega) and seme managed to save him away by asking him to have sex and they've been fuck buddies ever since. Seme also met his fated mates but went against fate and fall into a 5-year coma.
Omega no Kakushigoto wa, Hotel no Naka de
Summary: Uke (previously an omega) pretends to be a beta to work as a concierge at a hotel he met with seme when he was little.
Boku no Omega yo Samenaide