77 Group's Secret, 77단의 비밀, Secret of 77 Dan
Sang-ho and Sun-ja are kidnapped by someone and live in brutal abuse while performing acrobatics in a circus troupe called the "77th Dan". One day their uncle comes to visit them and they try to escape, but when Sun-ja is captured by the circus, a black hooded person, the object of Japanese fear, suddenly appears to help them...
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