Synopsis：Soohyeon is happily dating Joonsoo when she suddenly witnesses a serial killer who looks exactly like him brutally murder someone. She calls the police, but the man disappears without a trace. Growing suspicious, Soohyeon runs into him again and barely escapes his terrifying pursuit. Convinced the killer is Joonsoo, she reports him to the authorities—only to discover the Joonsoo at the station has no scar on his face, unlike the man she saw. What secret is Joonsoo really hiding?