I Open a Door in Another World

"Do you want to time travel?" "Would you like to obtain items from Earth?" "Do you want to travel to Earth?" "Welcome to the Alien Management Office, where you will receive the best service." "Our aim is to put service first and strive for excellence!" ... Xu Tianyou was able to open a door in another world unintentionally, and from then on he started a life of awesomeness, not pretending to be awesome but really awesome.