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

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

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

Yu Jae-seok then asked Choi San what kind of life he has been living lately. Choi San replied, "I'm receiving so much love these days." He also caught attention by spontaneously performing the choreography for "BAD", a track that has been gaining a lot of popularity recently.

When asked if he expected the current response while filming the music video, he honestly answered, "I originally thought fans would really like it, but I didn't know even the general public would love it this much." In response, Jee Seokjin asked, "So are things rolling in a bit these days?", inquiring about his income, to which Choi San honestly answered, "Oh, quite a lot," bringing laughter to the set.

As 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 chimed in, "He kept bragging about going to his gym."

At this, Choi San shared, "Actually, Jong-kook hyung told me in the past that my shoulders and back were great, but that it would be perfect if I worked on my chest a little more. I've been working hard on chest exercises ever since," giving credit to Kim Jong-kook and drawing laughter.