For generations, deadly storms have ravaged Mina's homeland. Her people believe the Sea God, once their protector, now curse them with death and despair. To appease him, each year a maiden is thrown into the sea, in the hopes that one day the "true bride" will be chosen and end the suffering.
Many believe Shim Cheong - Mina's brother's beloved - to be the legendary true bride. But on the night Cheong is sacrificed, Mina's brother follows her, even knowing that to interfere is a death sentence. To save her brother, Mina throws herself into the water in Cheong's stead.
Swept away to the Spirit Realm, a magical city of lesser gods and mythical beasts, Mina finds the Sea God, trapped in an enchanted sleep. With the help of a mysterious young man and a motley crew of demons, gods and spirits, Mina sets out to wake him and bring an end to the storms once and for all.
But she doesn't have much time: a human cannot live long in the land of the spirits. And there are those who would do anything to keep the Sea God from waking ...