Palangsae (2013)

One day, Soo-Min, Suk-Jun's girlfriend, reveals a secret. She tells him that he is not her 'first time'. However, that isn't everything. She also tells him that she once filmed herself 'doing it' with her ex-boyfriend. Here is the punch line. Soo-Min now asks Suk-jun, as her current boyfriend, to find the sex video-file, and delete it for her. The bewildered Suk-Jun, letting slide his girlfriend's questionable past for a while, sets off with his friend Hak-Soo to look for the file.