HIGHLIGHT will hold their solo fan concert '18-Year Idol Becomes a Rookie Trainee in Another World?!' from October 16-18 at Jangchung Gymnasium in Jung-gu, Seoul. The fan concert will proceed under the unique premise that an 18-year veteran idol suddenly becomes a rookie trainee, with members facing various challenges and quests to return to their original world while the love of BEAST's and HIGHLIGHT's fandoms is reset. Fans will participate as special trainers, directly recommending songs for members' challenges and group cover stages, creating a special interactive experience between fans and artists.