77Danui Bimil (Series)

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... (Source: Daum; translated)