"From now on, the job you will be performing is to attend to me in my bedchamber at night." Noyejoo (노예주), an Alpha university student, is somehow transported to another world (Isekai). Mistaken immediately for a slave, he is quickly sold off to a beautiful, elegant young master. However, the job he is expected to perform is not domestic service—it is night service (밤일)...! Meanwhile, the true identity of this young master is deeply suspicious... A powerful Alpha is stripped of his status and forced into a nightly servitude with a master whose intentions—and identity—are shrouded in mystery.