A backstory from a thousand years ago reveals the origin of the Bulgasals' ill-fated connection. Sacrifice puts an end to the immortal curse.

To settle the score for good, Hwal, Sang-un and Ho-yeol meet Eul-tae at the well. But one individual has a different plan for revenge in mind.

As Hwal vows to do everything in his power to capture Eul-tae, Sang-un reminds him not to lose sight of who he is on his path to revenge.

Hwal and Sang-un share conflicting memories of the past. Eul-tae channels his anger into a plan to take away everything Hwal cherishes.

Rattled by Eul-tae's remarks, Hwal seeks clarity on events that transpired a thousand years ago and how the bad blood started between him and Sang-un.

Hwal sets out to lock up Eul-tae for good. Trying to protect Sang-un from danger, Si-ho searches for a solution from her sister's past life.

Eul-tae invites himself into Hwal's home to look for Sang-un. Do-yun is kidnapped by a reincarnated monster seeking revenge on both Bulgasals.

Seeing Hwal and Ho-yeol together stirs up a bitter memory for Eul-tae. Nam Do-yun faces a dilemma when a Bulgasal asks him to return the favor.

Lee Hye-seok's prediction spooks Sang-un into searching for answers about her past. Despite Hwal's warning, Ho-yeol continues to look into Eul-tae.

Hwal takes Sang-un to a village to help retrieve memories from her past life. There, a monster tells of Eul-tae's secret in her final gasps of breath.

To defeat a greater evil, Sang-un and Hwal agree to keep each other alive for now. Kwon Ho-yeol steps into a hairy case of déjà vu.

Sang-un asks Hwal for help in avenging her family's death. Eul-tae tries to persuade the other Bulgasal into joining hands against a common enemy.

Sang-un finally remembers her sister's last words — and how to kill Bulgasal. Ok Eul-tae emerges out of the shadows to destroy an ill-fated soul.

A hair tie left behind at a crime scene leads Hwal closer to his target. Sang-un's past catches up to her during a night shift at the cleaners.

Hwal (now Bulgasal) waits for the woman to reincarnate for centuries only to lose her several times to the other demons holding a grudge against his soul. Until 2006, when he finds a fair chance to get his revenge on her, however, it goes incomplete due to a strange twist of fate.

A dying woman gives birth to a cursed child; He is rescued and adopted by the general of the kingdom's army, while a group of men tries to kill him. Years later, he goes in search of the monster who is the reason behind the curse, to find someone he had known before.