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Thirst (Bakjwi)
Catholic priest Sang-hyun volunteers at a hospital, providing ministry to the patients. He eventually volunteers to participate in an experiment to find a vaccine for the deadly Emmanuel Virus (EV). The experiment fails, and Sang-hyun is infected with EV, but makes a complete and rapid recovery after receiving a blood transfusion.
News of his recovery spreads among the parishioners of Sang-hyun's congregation, and they begin to believe that he has a gift for healing. Soon, thousands flock to Sang-hyun's services. Among the new churchgoers are Kang-woo, Sang-hyun's childhood friend, and his family. Kang-woo eventually invites Sang-hyun to join the weekly mahjong night at his house. There, Sang-hyun finds himself attracted to Kang-woo's wife, Tae-ju. Sang-hyun later relapses into his illness and wakes in need of shelter from the sunlight, having become a vampire.
Sang-hyun soon finds himself drinking blood from a comatose patient. Aghast, Sang-hyun attempts to commit suicide, but finds himself irresistibly drawn to human blood. EV's symptoms return and only seem to go away when he drinks blood. Trying to avoid committing a murder, Sang-hyun resorts to stealing blood transfusion packs from the hospital.
Tae-ju, who lives with her ill husband and overprotective mother-in-law Mrs. Ra, eventually begins an affair with Sang-hyun. However, when she discovers the truth about Sang-hyun, she retreats in fear. When Sang-hyun pleads with her to run away with him, she turns him down, suggesting that they kill Kang-woo instead.
When Sang-hyun's superior at the monastery requests vampire blood so that his eyes may heal and he may see the world before dying, a disgusted Sang-hyun flees from the monastery. He moves into Mrs. Ra's house so that he may secretly have sex with Tae-ju. Sang-hyun notices bruises on Tae-ju and assumes that Kang-woo is the cause, a suspicion that she confirms. Sang-hyun decides to kill Kang-woo during a fishing trip with the couple. He pulls Kang-woo into the water and claims to his superior that he placed the body inside a cabinet in a house at the bottom of the lake, putting a rock on the body to keep it from floating to the surface. When Sang-hyun's symptoms return, he kills his superior and drinks his blood.
A police investigation ensues. Mrs. Ra drinks often after Kang-woo's death, sinking into a completely paralyzed state. Sang-hyun and Tae-ju are haunted by visions of Kang-woo's corpse. When Tae-ju lets slip that Kang-woo never abused her, Sang-hyun is enraged because he only killed Kang-woo to protect her. Distraught, she asks Sang-hyun to kill her and let her return to Kang-woo. Sang-hyun kills her, but after feeding on her blood, decides that he does not want to be alone forever and feeds her corpse his own blood. She awakens as a vampire. Mrs. Ra, knocked to the floor by a seizure, witnesses everything.
Tae-ju soon starts killing indiscriminately to feed, while Sang-hyun acts more conservatively, only killing when necessary. Their conflicting ethics result in a chase across the rooftops and a battle. Mrs. Ra eventually manages to communicate to Kang-woo's friends that Sang-hyun and Tae-ju killed her son. Tae-ju kills two of the friends, and Sang-hyun appears to eliminate a third one. Realizing the gravity of the situation, Sang-hyun tells Tae-ju that they must flee or be caught. Sang-hyun then places Mrs. Ra in his car and drives into the night with Tae-ju. Before leaving town, he makes a visit to the camp of people who worship him. He makes it seem like he tried to rape a girl, leading the campers to chase him away, no longer idolizing him.
At the house, the third friend escapes; whom Sang-hyun only pretended to kill to protect her from Tae-ju. Meanwhile, Sang-hyun drives to a desolate field with no cover from the imminent dawn. Realizing his plan to have them both burn when dawn breaks, Tae-ju tries to hide but Sang-hyun foils her every attempt. Resigning herself to her fate, she joins him on the car hood, and both are burnt to ash by the sun, as Mrs. Ra watches from the backseat of the car.