Minhwan become the next head of the Jaegal family due to his brother's sudden death. Following his father's order, Minhwan goes to a forest. He entered The Yarim forest and encountered Dan-ryeong, the head of the Demonic Cult, his master. Dan-ryeong who seemed cold to everybody but Minhwan, caused him to develop feelings. The night when The Yarim was filled with the light of the full moon, Minhwan learns that Dan-ryeong has a liking for drinking blood. Hungry for affection, Min-hwan begs Dan-ryeong to drink his blood... "Master, after you finish drinking this blood, you must hug me again.” A master who covets his student's blood and a student who wants to be embraced by his master. The heartbreaking and impure full moon night is coming.