Big Thing follows the journey of a TV announcer, Maureen Seo (
Ko Hyun Jung), who will become the first female president of South Korea. She is not born from an influential family. She didn't also have a rich family (actually, there's no mention of her family in the series). She just wants to give justice to the death of her husband in the hands of terrorists, and all other problems that she saw around her.
It is also about the journey of Edward Ha (
Kwon Sang Woo), a happy-go-lucky guy who loves dancing and doesn't know what to do with his life. Until he saw his father humiliated by a congressman. He promised he will study and become a lawyer and work in the prosecutors office to sue corrupt public officials.