Kim Sunggyu, INFINITE's leader, kept a heartfelt promise he made to a fan during a concert last year. In April, at one of his shows, Sunggyu shared a touching story from a fan who became his admirer through his girlfriend. Moved by this, Sunggyu vowed to sing a song at their wedding if they decided to tie the knot. Come June, the couple returned to one of Sunggyu's concerts, revealing their engagement, and Sunggyu reaffirmed his commitment to perform his solo track, "You," for their special day.

Despite a tight schedule that included flying to Jeju for the Seogwipo Glocal Festival with INFINITE, on October 28, Sunggyu made it to the fan's wedding, honoring his word by delivering a heartfelt performance.

Fans were surprised and touched by the leader's action of keeping his promise despite having a busy day.