In Greece, Athens, Duke Theseus will marry Queen Hippolyta in 4 days.
Demetrius and Lysander both are in love with a woman named Hermia
Demetrius (orange) and Lysander (green) are in love with Hermia but she likes Lysander instead and this causes problems.
Demetrius slept with a woman named Helena and now she is in love with him
There are these mechanics that have to plan for a play at Theseus and Hippoltya wedding.
King of the fairies named Oberon is jelous that Titania who is queen of fairies is spending more time with a blue india boy instead of him.
So Oberon tells Puck which is one his fairies to use a love potion on Titania so she would fall in love with the first thing she see but also wants to put a potion on Demetrius so he would fall in love with Helena.