The movie was originally called The Bat movie to convey a sense of horror.It tells the story of Sang-hyun is a priest who is in love with his friend’s wife turning into a vampire through a failed medical experiment a priest whose free time is spent volunteering at the local hospital and providing ministry to the patients. He is well respected for his unwavering faith and the dedicated service he provides to all those around him, but he secretly suffers from overwhelming feelings of doubt and sadness about living in a world that seems to be drowning in suffering and death.Sang-hyun volunteers to participate in an experiment to find a vaccine for the deadly Emmanuel Virus (EV) with the hope of saving even one life, and heads off to Africa. Although the experiment fails disastrously and Sang-hyun is infected with a seemingly fatal disease, he makes a complete and rapid recovery.
News of his marvelous recovery is quickly spread to the devout parishioners of Sang-hyun’s congregation, and they begin to believe that the man has a miraculous gift for healing. Soon, thousands more people flock to Sang-hyun’s services. Among the new churchgoers are Kang-woo, Sang-hyun’s childhood friend, and his family. the previos day Kang-woo invites his old friend to join the weekly mahjong night at his house, and there Sang-hyun finds himself precariously drawn to Kang-woo’s wife, Tae-ju. Suddenly Sang-hyun relapses into his illness; he coughs up blood and passes away. however next day, he opens his eyes in dire need of shelter from the sweltering sunlight; he has become a vampire. Sang-hyun feels a newfound vigor and is energized by his insistent bodily desires, but soon he is aghast to find himself sucking down blood from a comatose patient in the hospital. After attempting to kill himself and he is drawn back to the taste of human blood against his will. the symptoms of F.I.V. have come roaring back. Desperately trying to avoid committing a murder, he resorts to stealing blood transfusion packs from the hospital. Tae-ju, now living with her ill husband and her over-protective mother-in-law.She finds herself drawn to Sang-hyun and his odd new physicality, and his inability to resist his desires. The two begin an affair, but when Tae-ju first discovers the truth about Sang-hyun’s new lifestyle, she retreats in fear. When Sang-hyun pleads with her to run away with him she turns him down, suggesting that they kill her husband instead. "this movie was a horror and Dramatic movie korean film movie"