This Poor Beta Doesn't Know About Love(2021)

Aware na β ha Koi wo Shiranai

Suzuharu Seno, a beta, serves Ryousuke Isezaki, an alpha and heir to a big family, as his personal butler. A free spirit, Ryousuke not only brings his omega flings home, but even makes passes at Suzuharu. Suzuharu knows that he's not serious, but his desire builds up anyway...

The long anticipated spin-off from the "Dirty Omegas Don't Fall in Love" series!! An omegaverse story portraying the distorted love of an alpha and beta's master-servant relationship.

(Source: Renta!)