Question: Defendant, is a South Korean television series stars include Kwon Yu-ri, better known by the mononym Yuri, is a South Korean singer and actress, and debuted as a member of which girl group, in August 2007?
Sentence (from "Defendant (TV series)"): Defendant () is a South Korean television series starring Ji Sung with Um Ki-joon, Kwon Yu-ri, Oh Chang-seok and Uhm Hyun-kyung.
Relevant evidence: Yes