After dealing with annoying customer, Xiao is waiting for his sister to pick him up. But this time he hears a beautiful singing from a nearby stage. His heart starts to pounds faster, and Xiao is amused by this person voice. After this day he is always waiting after work to hear their voice, but when he doesn't hear it second time, he is strangely disappointed. He feels emptier than before, just like someone take his feelings out of him. Would he ever hears their voice again? Modern au • Cashier!Xiao • Singer!Venti