Singer Sung Si-kyung admitted and officially apologized for the alleged illegal operation of a single-person agency.On the 18th, Sung Si-kyung opened her mouth on her SNS, saying, `I am truly sorry that I caused a lot of people to worry about something related to me.\'He started a one-man agency in 2011 after going through a lot of things while moving around from one company to another after his debut\"It was intended to reduce the size and cost and to do as much as I can.\", he explained.Sung Si-kyung \"Wi
