Choi San of the Northern Grand Prince made an appearance on Running Man.

On the September 13 broadcast of SBS's Running Man, ATEEZ member Choi San appeared as a guest.

During the broadcast, the members welcomed Choi San, shouting, "It's a triumphant return!" Recalling how Choi San used to run up mountains alone filming a spy-like concept five years ago, the members cheered, "He's not the same San as back then. He has returned as a star."

Yu Jae-seok then asked Choi San what kind of life he has been living lately. In response, Choi San said, "I am receiving so much love these days." He then drew attention by performing an impromptu version of the choreography for "BAD," which has been gaining immense popularity recently.

When asked if he anticipated the current response during the music video shoot, he honestly replied, "I originally thought fans would really love it, but I didn't know even the general public would love it this much." At this, Jee Seokjin asked, "So, are things coming in well these days?" inquiring about his income, to which Choi San candidly answered, "Oh, tremendously," drawing laughter.

While Yu Jae-seok praised the great harmony of his visuals, facial expressions, and choreography, Kim Jong-kook added, "Plus San's physique." Yu Jae-seok remarked, "He kept promoting that he goes to my gym."

Upon hearing this, Choi San gave credit to Kim Jong-kook, saying, "Actually, Jong-kook hyung told me in the past, 'San, your shoulders and back are great, but if you work on your chest a bit more, it'll be perfect.' I worked hard on chest workouts ever since," bringing laughter to the set.

(SBS Entertainment News, Editor Kim Hyo-jung)