Breath (2007)

Bored Seoul wife Yeon (Park Ji-A) is gripped by a news story about Jang Jin (Chen Chang), a Death Row prisoner who has attempted suicide by stabbing himself with a sharpened toothbrush handle. Oddly drawn to him, Yeon heads to the prison to become his new best friend - and his unofficial interior decorator... As she brightens his cell with wallpaper and trinkets and his silent existence with song, a relationship develops that confounds observers.