The people called him a god, but the King he served grew jealous and pierced his chest with a sword. After living as a hero and dying as a traitor, he became a 'Goblin' who lives an immortal life with a great sword lodged in his chest. For over 900 years, he has wandered the world in solitude, waiting for the 'Goblin's Bride' who can pull the sword out. Upon finally meeting and falling in love with Ji Eun-tak, he becomes a poignant and radiant figure, deeply agonizing between his desire for the end of eternal life (death) and his longing to stay by her side.

She is the 'Goblin's Bride' who was destined never to be born but survived by a miracle through the mercy of the Goblin, Kim Shin. She has possessed the ability to see ghosts since birth, which led her to grow up as an outcast. Despite the harsh mistreatment from her aunt's family, she is a high school senior who grew up bright and resilient. She recognizes the mysterious Kim Shin as the Goblin at a single glance and possesses a bold, charming personality.

He woke up to find himself a Grim Reaper with no memory of who he was or what sins he had committed. While he is a cold and elegant guide for the souls of the deceased, in daily life, he shows an unexpected charm by engaging in petty bickering with Kim Shin over every little thing. Upon seeing a woman named 'Sunny (Kim Sun),' he finds himself shedding tears without knowing why, stepping back into the cycle of a cruel and sad fate from a past life he cannot remember.

A chicken shop owner who believes money is everything and thinks living thoughtlessly is the easiest way to get by. Although she possesses a dazzling beauty that instantly captures everyone's attention, she has a surprisingly easygoing and fiery personality. While living a lonely life on her own, she finds herself drawn to the recklessly innocent Grim Reaper she met on the street. Her true identity is 'Kim Sun,' the Queen of Goryeo and Kim Shin's younger sister in a past life, continuing a deep and affectionate narrative of love in this life.

The only son of the fourth generation of a vassal family that has served the Goblin for generations, and a third-generation chaebol heir. Although he appears reckless, immature, and money-obsessed, he has a thoughtful side, quietly staying by his uncle Kim Shin's side when he is lonely. He is also the one responsible for making Kim Shin and the Grim Reaper live under the same roof.

The goddess of life who presides over childbirth. She is Eun-tak's guardian deity and an absolute being who announces the cold law of their tragic fate: "If one lives, the other must die."