Mina is a determined, compassionate young woman from a seaside village plagued by deadly storms. Driven by deep devotion to her family, she willingly sacrifices herself to the Sea God to spare her brother's beloved. Arriving in the Spirit Realm, she sets out to lift the curse on the slumbering deity, refusing to accept the grim fate forced upon her people.

Shin is the enigmatic, guarded lord of Lotus House within the Spirit Realm. Tasked with protecting the Sea God, he maintains a strict, aloof demeanor while managing the complex politics of the divine city. His actions toward Mina are contradictory, alternating between cold detachment and fierce physical protection.

The Sea God is a powerful deity whose wrath is believed to cause the destructive storms ravaging the human world. Instead of a fearsome monster, he appears in the Spirit Realm as a sorrowful, lonely figure trapped in a cursed sleep. He is the intended recipient of the human brides sacrificed by the seaside villages.

Joon is Mina’s older brother, a young man who deeply loves Shim Cheong. He breaks sacred village rules by accompanying Cheong to her sacrificial boat, demonstrating a protective, rebellious nature that ultimately inspires Mina to take Cheong's place to save him from a broken heart.

Shim Cheong is a girl from Mina's village renowned for her beauty and originally chosen to appease the Sea God. Her grim fate as the sacrificial bride serves as the catalyst for Mina's impulsive journey into the Spirit Realm.

Namgi is a playful, charismatic lord of Lotus House and a mythical water snake, or Imugi, who aspires to become a full dragon. He provides a lighter, more humorous presence in the Spirit Realm while remaining fiercely dedicated to his friends.

Kirin is a stoic, pragmatic figure in Lotus House who acts as a loyal guardian and advisor to Shin. He operates with a strict sense of duty, often serving as the voice of reason among his peers in the spirit city.

Mask is a resourceful spirit who wears a wooden mask with changing expressions. She moves through the bustling city of the Spirit Realm with ease, offering immediate assistance and advice to Mina when she is stranded without her voice.

Dai is a nurturing, protective spirit residing in the Spirit Realm. He chose to leave heaven to remain close to the infant spirit Miki, demonstrating a deep capacity for love and self-sacrifice as he guides Mina through the dangerous city.

Miki is an infant spirit in the Spirit Realm who is constantly protected by Dai. Her innocent presence softens the often harsh realities of the divine city.

Shiki is a death god characterized by a melancholic demeanor that contrasts with the vibrant atmosphere of the spirit city. He is responsible for managing the River of Souls and maintaining the delicate balance between life and death.

Hyeri is a former bride of the Sea God from Mina's village. Having entered the Spirit Realm before Mina to escape her painful mortal life, she is now the bride of the death god Shiki.

Nari is a girl from Mina's village who was previously believed to be lost to the sea. She now works as a servant in Lotus House and offers a familiar face to Mina in the strange divine world.

Lord Yu is the head of Crane House who possesses extensive knowledge about the Sea God. His initial scholarly demeanor hides a more aggressive, dangerous agenda regarding the politics of the Spirit Realm.

The Goddess of Moon and Memory is a powerful and aloof deity who controls the Imugi. She operates with a cold detachment from human suffering and collects memories contained in paper boats sent by mortals.

Ryugi is an Imugi and Namgi's brother. He aligns himself against Shin's faction, contributing to the dangerous political tensions surrounding the slumbering Sea God.