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I suddenly remembered a manga i used to read can someone help me? Its a yaoi

All i remember is, it is an omegaverse the mc is a beta and the ml is an alpha, they have a master servant relationship ,i remember they had a bet in one of the chapters where they'll be in a relationship together for a period of time and in that period of time the ml tries to make mc fall in love with him but if the mc doesn't it'll go back to them being master servant,the mc is a butler.

+ When the time for the bet ended the mc decided to still become a butler which makes the ml mad and treated him as any other butler , the mc felt abandoned when the ml didn't call for him alot than before,