The band enter their final week of training in South Korea and have to perform for two very different audiences. First up is a crowd of 700 dignitaries at the British Embassy as part of King Charles's birthday celebrations. Then their toughest audience yet, a group of eager K-Pop fans who are ready to pass judgement on Blaise, Dexter, James, Olly and Reese. What will they make of the pop world's newest band? With just one evaluation left, Dexter is keen to impress the K-Pop creator Hee Jun Yoon and turns to his band mates for support. Can he control his breathing and finally get the approval of his toughest critic? Social media influencer the K-Pop Cowboy takes the boys on a high-speed water challenge to show them how to create content that could go viral. And as the boys bid to say farewell to Seoul, they reflect on the past hundred days and their hopes for the future, but will they leave with the blessing of Hee Jun Yoon as they embark on the next phase of their pop adventure?