Season 1
1945, Gyeongseong South Korea. Jang Tae-sang is a rich man. He is known as the most attractive man around Bukchon in Gyeongseong. He is also a reliable source for information in the area. His talents, including the ability to respond quickly to situations, keen insight and his sociability, have led him to his current position. When he comes into contact with Yoon Chae-ok, he has to reevaluate his priorities as a person.
Episodes
Najin
Facing financial ruin, Jang Tae-sang agrees to track down a missing person — but two figures trail him. Meanwhile, sinister operations occur underground.
Mother
Yoon Chae-ok and Yoon Jung-won find a lead on Myeong-ja, leading them to a hospital. Soon, a calamity traps the two inside, leaving Tae-sang concerned.
Signal
Tae-sang decides to reenter the hospital, but discovers that Ryu Sachimoto is nearby. At the hospital, Chae-ok and Jung-won devise a risky rescue plan.
Imprinting
Reunited in their search for Myeong-ja, Tae-sang and Chae-ok attempt to also save other survivors. But soon, the monster makes itself known.
Desperation
After coming face to face with the creature, Tae-sang and Chae-ok get captured. But as one plans his escape, the other stays to find a person dear to her.
Chaos
Tae-sang steadfastly remains to save Chae-ok and the captives. On a mission to find her mother, Chae-ok learns the grisly truth — and confronts the beast.
Chase
With only 10 minutes to act, Tae-sang and Chae-ok risk it all to get everyone to safety. But just as all goes to plan, one of them may not get out alive.
Awakening
An unlikely acquaintance becomes Tae-sang's ticket out of the hospital. After a touching reunion, Tae-sang and Chae-ok encounter a transformed Myeong-ja.
Atrocity
After a series of grisly deaths, Ishikawa finds Myeong-ja in her new state. Tae-sang shares a tender moment with Chae-ok, unaware of her hidden plan.
Tear
In order to rescue Chae-ok and stop the atrocity, Tae-sang and Jung-won forge a plan. But just as the coast seems clear, Yukiko Maeda stands in the way.