Grieving the loss of a best friend she couldn’t protect, an ex-bodyguard sets out to fulfill her dear friend’s last wish: sweet revenge.

Connected by phone in the same home but 20 years apart, a serial killer puts another woman’s past — and life — on the line to change her own fate.

Deliveryman Jongsu is out on a job when he runs into Haemi, a girl who once lived in his neighbourhood. She asks if he’d mind looking after her cat while…