After completing his residency, Seolwon opens an ophthalmology clinic in his hometown, Seansi.
Since he’s back home, he decides to spend a holiday at a mountain villa with his longtime friends.

However, due to unforeseen circumstances, his friends are unable to come until the next day,
leaving Seolwon to spend the night alone at the villa.

What wakes the sleeping Seolwon is the sound of a strange intruder.
Terrified, he tries to contact his friends and the police, but…

“I’m really sorry. The car can’t get through right now.”
“Caller! Due to the heavy snowfall, access to the mountain is currently impossible!”

…He ends up completely cut off.
And worse yet—
alone with a mysterious intruder, Alpha Gu Hae-joo