You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "When did the group debut that Kang Sung-hoon is a part of?" whose answer is April 15, 1997.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Kang Sung-hoon group
Useful Output:

Doc 1: Kang Sung-hoon, main vocalist of K-pop group Sechskies, has been accused of swindling an acquaintance out of 140 million won ($130000).
Doc 2: Kang Sung-hoon, who debuted as the main vocalist of the group Sechs Kies in 1997. Since then, he has released his solo songs "You Are My
Doc 3: Kang Sung Hoon was also sued by fans on accusations of embezzlement through his fan club, Hoony World. According to the complaint filed by fans,
Doc 4: Kang Sung-hoon made his debut as a member of the first-generation idol group Sechs Kies in 1997 and became popular. He was recently appointed as
Doc 5: Kang Sung-hoon made his debut with the SechsKies in 1997 but was also arrested in court on fraud charges after the team disbanded. He was later