Season 1 of Birth Secret premiered on April 27, 2013.

Jung Yi Hyun is a genius, but she suffers from psychogenic amnesia and does not remember her husband and young daughter. Hong Kyung Doo is uneducated and poor, but he's a loving father to young Hong Hae Deum, who's inherited her genius from her mother. Yi Hyun and Kyung Doo met just as both were on the brink of suicide, and they'd decided to choose life together. The drama is about Yi Hyun's journey to putting together the pieces of her lost memory with her husband's help, a man who seems completely unsuited for her.