Shunka torikae Shou [Web Version]

A talented elder sister becomes a civil official and a beautiful younger brother becomes a courtesan!
Shunran and Shunrei are twin siblings born into a family of poor local bureaucrats. However, the elder sister, Shunran, is so clever and the younger brother, Shunrei , is so beautiful that they are often mistaken for each other. The rumour that "the elder sister is the most beautiful woman in the world and the younger brother is a smart and promising young man" finally reached the ears of the emperor, and Shunran was assigned to work in the imperial palace! Shunrei is also forced to take the examination... The two, trapped in a corner with an unwanted future, decide to switch places and live together!