Woman (1968)

A man meets a woman on his hiking trip to Mountain Seorak, but she suffers from incurable diseases. He becomes infatuated with her hair. When he tells her about his feeling she promises him that she would leave her hair after she dies as part his heritage for the man. But when he looks for her later she is already dead, and her hair was already sold to another person. He meets another woman he becomes intimate with, but finds that she is his biological mother.

Unfortunately the movie Woman is not yet available on HBO Max.