Kihyun of MONSTA X has released his second mini-album 'BORDERLINE', featuring the lead single 'So Good' and its English version, ahead of his North American tour. The album marks a significant solo milestone, supported by a series of promotional activities including stage performances, concept photos, and a surprise appearance by his bandmates. Kihyun concluded his promotions with a heartfelt message to fans, known as Monbebe.