 There had already been prior speculation about a reunion as Kim himself, leader Eun Ji-won and vocalist Jang Su-won had cautiously hinted that all members were in discussions except vocalist Ko Ji-yong, who had completely left the entertainment industry to start his own business and was already married.During the "Totoga" segment of "Infinite Challenge", the five members organized a guerrilla concert, the first time they had stood together on stage as SechsKies in over fifteen years.Ko made a surprise appearance backstage to reunite with the five members and during the concert for an emotional rendition of their award-winning hit "Couple".