Revert "#930 modify Router class call position"

This reverts commit 21bd343048698b1baa91c21e75715750a3734302.
Revert "Router class 개선 및 오류 수정"

This reverts commit 8cf12f63b8b149136b56c6df16ebfcb84088497d.
Revert "singleton 객체를 사용하는 대신에 static method로 변경"

This reverts commit 9cbad3147b772f4bc3658235e26869f15f06204d.
Revert "Router 기능 추가"

This reverts commit bbdd1874de7796a9e09ed036212f8fc0046d8f69.