In 1999, a voice actor moves from Il Mare, a seaside house, and leaves a Christmas card in its (magical) mailbox. An architecture student receives it in 1997, and a friendship separated by 2 years begins.
Pastor Park works to expose suspicious religious groups. He's hired to look into the cult group Deer Mount. Meanwhile, Police Captain Hwang investigates a murder case and the main suspect is a member of the Deer Mount cult.
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