Hermia is Egeus’s daughter, and a young woman of Athens. Hermia is in love with Lysander and is a long-time friend of Helena. The fairies’ mischief with Oberon’s love potion, causes both Lysander and Demetrius suddenly fall in love with Helena. By morning, Puck has sorted matters out with the love potion, and Lysander’s love for Hermia has returned.
Helena is a young woman of Athens, and is in love with Demetrius. Demetrius and Helena were once engaged, but when Demetrius met Helena’s friend Hermia, he fell in love with her and left Helena. Helena believing that they don't love her, she thinks that Demetrius and Lysander are mocking her when the fairies’ causes them to fall in love with her.