These three films all feature on a box set put out by the Korean Film Archive, though many of their film restorations (not just these three, but many others) are available to view for free on an official website and a YouTube channel, which I’d recommend checking out if you want to follow up on classic Korean cinema. As for the director, I can’t give you much information. His name is sometimes transliterated as Lee Man-hui, and he was born in Seoul in 1931 and studied there too. He started out in the industry as an actor in the 50s, but had graduated to directing in 1961 and as a director had a prodigious output for much of the 1960s, making up to 10 films in a single year (1967 seems to have been his most prolific). He died at the age of 43 from liver cancer, in 1975.