KSI is a British YouTuber and social media star. He started making videos in 2008 and became famous online quickly. KSI is also a musician, a former boxer, and the founder of Prime hydration drink company. Sidemen is a group of British YouTubers who make comedy, football, and challenge videos. They have over 140 million subscribers on YouTube. KSI said he left Sidemen because he has moved forward in many areas of his life. He said he feels like he's running 100 miles per hour. KSI said there's nothing bad between him and Sidemen, and it was his own decision. Sidemen supported KSI's decision and wished him good luck. KSI is involved in many other things, including being a judge on Britain's Got Talent, a musician, and a football team owner. He also founded Prime FC, which won the Baller League UK season 3 championship. Did you know that KSI founded Prime hydration drink company and sells its products? He's also a football fan and has played many football games. KSI's decision to leave Sidemen surprised many of his fans. But KSI said it was his own decision and there's nothing bad between him and Sidemen. Sidemen wished KSI good luck and success in his future endeavors. In the end, KSI's decision to leave Sidemen surprised many fans, but he will continue to work on many other projects, and his fans will eagerly wait to see what he does next.