Twins Viola and Sebastian were the best of friends, they grew up together and learned together. Disaster struck when they were on boat trip and the boat sunk. Viola was able to grab onto her brothers clothes trunk which led to land.
You have stole Olivia's love. I shall now duel you
When Viola reached the shore, she changed into Sebastian's clothes and named herself Cesario so she could become a servant to Duke Orsino.
If you harm one hair of this young man's head, I'll carve you up like a joint of beef
Cesario (Viola) had fallen in love with the Duke when Orsino had confessed his love for Olivia. The Duke asked Cesario to go to Countess Olivia and tell her, "If she won't marry me, then I'll waste away and die."
Cesario went to Countess Olivia's house and told exactly what Orsino had told her to say. Olivia took a glimpse at Cesario and deeply fell in love. Viola panicked about Olivia's love for her and went back to Orsino.
Sir Andrew, Olivia's uncle's friend wanted to duel Cesario for taking Olivia's love, but is stopped by a man who thinks Cesario is Sebastian, Viola's twin. She tells him about it and then reunites with Sebastian.
Olivia and Sebastian meet each other and get marry as well as Viola who reveals her true self to Orsino who falls in love with Viola.The End