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기존의 stopAnimation 함수에서 subView들을 삭제해서, 저도 subLayer를 삭제하는 방식으로 로직을 변경했습니다.
background에 갔다 오니까 애니메이션이 멈춰버려서 그 부분을 수정했습니다.
random 수치를 구하는 함수를 계산 프로퍼티로 변경했습니다.