Molka by Monika Kim

Junyoung and Dahye are colleagues;
he has a taste for voyeurism
and she a hunger for revenge.

Molka (n): the Korean term for spy cameras secretly and illegally installed, often to capture voyeuristic images and videos.

Dahye has met the man of her dreams - Hyukjoon, who happens to be the heir to a multi-billion fortune. Till one day, a video of them having sex goes viral.

She is all over the internet and he is nowhere to be found.

Junyoung is a nobody; a nothing office worker who harbours a dark secret: in every women's cubicle, shower and bathroom in his workplace, are cameras - his secret cameras. Junyoung spends his days watching and preying on his unsuspecting female victims.

Soon his perverse obsession turns to Dahye - but, this time, he has chosen the wrong woman to wrong.

When Dahye's pain turns to blind rage - she decides that she will not rest until he has paid in blood...