The Boyz member Hyunjae became a hot topic on social media after a recent concert.

The IST Entertainment boy group held their 'ZENERATION' concert in Seoul from May 19 - 21 at the KSPO Dome. During the third night of the event, Hyunjae pulled open his shirt while the members freestyle danced to their single "Thrill Ride," showing off his toned physique to not just concertgoers but fans around the world that had been tuning in via Beyond LIVE.

The moment caused such a stir that "Lee Jae Hyun [Hyunjae's real name] abs" became a trending topic on Twitter for several hours, along with fans' photos, video footage, and screenshots of the moment.

Photos were also spread on Korean online community boards, with one poster writing, "Hyunjae caused an uproar and remained on Twitter real-time trending until dawn after revealing his abs during The Boyz's final concert yesterday hahahaha." Netizens who engaged with the post included many The Boyz fans and non-fans alike, leaving amusing responses like, "I'm not a K-pop fan, but I'm going to be a Hyunjae fan from today," "Was this a strip show?," "He's the reason my voice is hoarse today," "Take this post down! He's for The B [The Boyz's fandom]'s eyes only!," "Stop flirting with me, Lee Jae Hyun...," "Don't look at this prince's body," and "Lee Jae Hyun was insane yesterday."

Meanwhile, the 'ZENERATION' world tour will be continuing its Asia leg starting with Niigata, Japan on May 31.