Once upon a time in Illyria, their was a Duke named Orsino. One day in his castle he sat and listened to the live band, while talking about love.
Then came a girl named Viola who was in love with Duke Orsino, who is in love with another girl named Olivia, who is in love with Viola's male disguise, Cesario. Neither Duke Orsino or Olivia knows that Viola is really a woman.
Viola who is disguised as Cesario starts to fall for Duke Orsino, who is still in love with Olivia. Olivia, however, falls in love with Cesario, who is really Viola.
Olivia gets mad because she sees Cesario/ Viola talking to Duke Orsino
Viola's twin brother Sebastian comes to Illyria and he is mistaken as Cesario by Olivia and is asked to marry her to which he then agrees.
Sebastian marries Olivia who thinks he is Viola. When Sebastian and Viola finally are seen together and revealed as twins, Viola declares herself for the Duke and their marriage is announced.