Serotonin

Kai Wilkinson is a sensitive, smart and kind guy, at 25 years old, he took the decision to move to South Korea to start a new life after so many difficulties he has been trough since childhood.
After finding a place to stay and a stable job at a big corporation as a programmer, feeling lonely he created an account on a "meet a friend around application".
The first person matched on the app was Taeyang, they started to talk and it was like they knew each other for years, nevertheless, Kai decide to meet his new friend, but strange events start occurring since that moment.