The police held a press conference on March 4, saying they had not seen the original, unedited KakaoTalk messages and doubted their veracity, just prior to an SBS report detailing how they had obtained them. On February 27, Seungri was questioned by the SMPA, a lengthy interview that lasted overnight and included a drug test. Seungri denied allegations of attempts to buy sex for potential foreign investors (or sex for business favors) and any knowledge of the KakaoTalk messages, which had been disclosed by media, conversations he allegedly had with a Burning Sun co-founder and another of its employees about such arrangements; and he denied drug use. Media reports said that various nightclubs were used for the lobbying, including one named Arena, where Seungri allegedly arranged sexual favors for investors. In one alleged chat conversation between Seungri and his business partners in December 2015, Seungri says, "Give B (the anonymous investor) everything she wants. Get a hold of the main [rooms] 3 and 4 at the [club] Arena. We have guests from Taiwan". After confirming arrangements with a man surnamed Kim, Seungri asked, "“And what about the girls? [Give them] the easy girls.” Yoo answered, “I’m getting the prostitutes ready, so if you get two prostitutes, then lead them to the hotel rooms. Two is good?” On March 10, Seungri was booked on sex bribery charges. The following day, he resigned from entertainment on his Instagram account, stating that he had caused a "societal disturbance" and said he would cooperate with the investigation. The source of the KakaoTalk messages was revealed to be a lawyer, Bang Jung-hyun, on March 11, when he was interviewed on "SBS Eight O'Clock News". He had obtained the messages from a whistleblower or "anonymous source", possibly a technician at a phone repair shop, where singer and entertainer Jung Joon-young had dropped his phone off for repairs. The whistleblower had sent an email to Bang, of thousands of chats taken from Jung's phone, which took place over eight months between 2015 and 2016. When the Burning Sun scandal started, the phone messages were forwarded to the Anti-Corruption and Civil Rights Commission and to SBS FunE; and the secretly filmed sex tapes and other chat messages on Jung's phone became public. During the SBS interview, the integrity of the chat room file was discussed, and was said to have a tamper-proof device, technically a hash-code verification, showing that the file had not been manipulated; and could stand as circumstantial evidence to seek more evidence.