Sound of Magpies(1967)

Original title: 까치소리

Bong-su, who has been missing since the Korean War, returns to his hometown. A death notice for him has already been sent to his hometown, and his fiancée, Jeong-sun, has already married another man, Sang-ho. Bong-su tries to persuade Jeong-sun to forget about Sang-ho and return to him, but she tells him that it's something that cannot be undone. Tormented by his pain, Bong-su begins to show signs of delusional behavior and ends up strangling Jeong-im, Sang-ho's younger sister, who had a crush on him. Later, it is revealed that the death notice for Bong-su was a fake, created by Sang-ho so he could marry Jeong-sun.