Who is Choi San?

Choi San is a member of the South Korean boy group Ateez. Fans have nicknamed him '북부대공' (Duke of the North) for his look, which resembles a character from a romance fantasy novel. According to MBC's broadcast preview, Choi San says he weighed 52kg when he debuted.

When does the Ateez episode air?

The full group appears on MBC's variety show 'Omniscient Interfering View', airing at 11:10 p.m. KST on October 24. The episode follows the members' daily lives, Choi San's workout tips and behind-the-scenes stories.

How did Choi San change his body?

According to the show preview, Choi San built broader shoulders and a firmer chest through steady exercise. During an awards trip in Busan, he trained at a hotel gym, doing pull-ups and heavy dumbbell work even with a packed schedule.

What happened at the gym?

Members Seong-hwa, Wooyoung and Jong-ho, who are part of the group's workout crew '으쌰으쌰 팀', joined him. They teased him, copied how he drinks water and named a plain toast '최산표 가슴 토스트' (Choi San chest toast).

What else does the episode cover?

The episode also looks back at the group's injuries, including rib and finger fractures, that members performed through. Ateez became the first K-pop boy group to perform at Coachella in the United States, and the show shares behind-the-scenes of the 'BAD' stage.

For international fans

Ateez debuted nine years ago and has been active internationally, including a Coachella stage. The show is in Korean, so international viewers will likely need subtitles or a translated recap to follow the jokes.