Mist

Mist (Korean: 안개) is a 1967 black and white drama film directed by Kim Soo-yong about a businessman, Yun Gi-jun, who married into wealth and lives in Seoul, travels back to Mujin, his hometown. He embarks on a love affair with the local music teacher Ha In-suk and starts questioning his life choices.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.