Singer Sung Si Kyung's sister and management office referred to prosecutors for ”operating an entertainment agency without registration”... What about Sung Si Kyung?

Singer Sung Si Kyung's sister and her management office have been referred to the prosecution on suspicion of operating an unregistered entertainment agency. According to the police on the 10th (today), the case was brought to the Yeongdeungpo Police Station in Seoul.
On the previous day, the 9th, Sung Si Kyung's sister, Ms. Song, and management office SK Jaewon were referred to the prosecution on suspicion of violating the Popular Culture and Arts Industry Development Act.
The police said that Sung Si Kyung, who was also accused, was objectively believed to have directly intervened in the management office's operations.
SK Jaewon is a one-person entertainment agency whose CEO is Song's sister, and was granted a registration for the Popular Culture and Arts Planning Business by the Ministry of Culture, Sports and Tourism.
According to Article 26 of the Popular Culture and Arts Industry Development Act, anyone who wishes to engage in related businesses must register with the Ministry of Culture, Sports and Tourism.
In an official statement released in September, the management office said, "Our company was established in February 2011 in accordance with the law," and "In January 2014, the Popular Culture and Arts Industry Development Act was enacted,
"A new registration requirement has been established and implemented for pop culture and arts planning businesses," the company explained. "Our company was not aware of this registration requirement, and as a result, we were unable to proceed with the registration process."
"We deeply apologize for our lack of awareness and preparation regarding the relevant laws and regulations," the company said.