Urangoo Enkhtaivan

A young man named Zolboot moves into a new apartment. From the day he arrives, he witnesses a horrific murder, and a mysterious killer in a black mask begins to threaten him. He receives terrifying calls from the murderer every day, leading him into a deep psychological crisis as he starts to lose his sanity. Ultimately, he realizes that the unknown killer is...

Five girls friends 20-25 year old will awake in a black basement. Unfortunately they don't remember why they are in that position. They have to figure out what made them to be there.