The Theory follows three stories of love. 

A student named Konpord falla in love at first sight with a graduating senior, Rahat, and he tries to woo him so he does not lose him forever. 

Tawan believes in destiny. One day, he meets a shy guy, Met at the bookstore. Days pass by, and he meets him again in three different scenarios. Is it fate?

For Tai, happiness lies within being himself. If he can't find someone who can adapts for him, it's better to be alone. What will happen if he found Prab, his other half?