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Yoo-jin is rough and manly while Yoo-jeong is feminine and cute. Yoo-jeong works in an office until she finds out she's getting fired. The chairman uses this against her to provide sexual service and Yoo-jeong has no choice but to spend a night with him. Yoo-jin finds out about this and makes a plan to make him pay back...
A gloomy energy suddenly falls over a group of veterinary students who have to go deep into the mountains of Gangwon-do to track a released black bear. The deeper they go into the mountains, the more the black bear tracker hovers around the same spot, and the fear slowly creeps in...
