Whale Waterfall and Deer Leaves are lovers' names, because you see deer in the deep forest and whales when the sea is blue. The online name of a couple is an ambiguous name for two people to locate each other in the network. Screen name refers to the name used on the Internet. Because the network is a virtual world, in order to avoid the trouble caused by using real names, the screen name was invented. At the same time, the screen name can be changed at will, completely according to your own wishes.