A shipwreck causes twins to separate and Viola wakes up in Illyria. She dresses up as a boy and calls herself Cesario so she can work for Duke Orsino. Orsino is in love with the countess Olivia but she is mourning for her dead brother and rejects him.
Despite Olivia's rejection Orsino sends Cesario (Viola in disguise) to Olivia on his behalf. Cesario goes even though he is in love with Duke Orsino. Olivia is attached to the boy and decides to send Malvolio with a ring .
Malvolio is getting pranked as he gets a letter which he thinks is from Olivia and he thinks she loves him. However, he doesn't know it is a prank and he dresses up in yellow stockings .
Viola's twin brother Sebastian who survived the shipwreack has arrived in Illyria. Sir Andrew is jealous and decides to challange Cesario for a duel but Antonio interferes mistaking Viola for her Brother. Olivia has meet Sebastian and is engaged with him.
Meanwhile Cesario is accused for deserting Antonio and when the real Sebastian is reveled the twins see each other again and everything is reveled .
Orsino is attraction towards Viola and asks her to marry him once she is dressed as a women again.