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Intro. The female demon Tan Lang in the Four Blessings of Heaven (also known as Tuyen Co) is one of the Four Great Harms of the Demon World, with a tragic past and a complex personality. She is a villain in one part of the story, representing the brutality and suffering that has transformed her into a demon, despite being once a beautiful and pitiful woman. Traumatic past: Tan Lang was once a beautiful girl who was betrayed and humiliated, leading to her tragic death and turning her into a demon woman. (He once fell in love with a man named 'Buoi Lan' and he turned into a god in heaven.)

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