Once in a Summer (2006)

An assistant producer promises to have her reserved, but renowned professor, appear on a television series. The show involves locating long-lost loved ones from their past. At first hesitant, his story takes them back to 1969 when Korea was in chaos.

Once in a Summer is a drama movie featuring Lee Byung-hun and directed by Joh Keun-shik.

Once in a Summer is currently streaming for free (ad-supported) on Rakuten Viki and it's also available on Rakuten Viki.