More than two decades after one of South Korea's most infamous celebrity scandals, singer Steve Yoo, better known in Korea as Yoo Seung-jun, says he has finally let go of his long-running fight to return. The former K-pop star, whose 2002 acquisition of U.S. citizenship sparked a national controversy over military service obligations, said he no longer sees much point in pursuing a return to Korea. On Thursday, Yoo uploaded a video to his YouTub…