As of my last update, "A Frozen Flower" might be available on various streaming platforms that specialize in Korean or Asian cinema. Services like Viki, KBS World TV, and others often feature a wide range of Korean films with English subtitles.
While set in the Koryo dynasty and loosely based on the reign of King Gongmin, the film prioritizes dramatic storytelling over strict historical accuracy. Critical Reception a frozen flower filmyzilla link