Question: Splendid Politics, is a 2015 South Korean television series, stars included in the film is which  South Korean actor and singer, who is a member of which group ?
Sentence (from "Splendid Politics"): Splendid Politics () is a 2015 South Korean television series starring Cha Seung-won, Lee Yeon-hee, Kim Jaewon, Seo Kang-joon, Han Joo-wan and Jo Sung-ha.
Relevant evidence: No