On March 20, 2026, Theo dropped a fresh Instagram update—and it's already turning heads. In the video, Mimi joins the 'Big Guy Challenge,' showing off her playful strength in the cutest way. Dressed in a lovely floral blouse and denim pants, Mimi cracks fans up as the arms visible from behind become the unexpected highlight. Fans reacted in droves, leaving comments like, "When Mimi moved to the back, her arms got so cute." The challenge features Seokjin and Mimi from Netflix's new program 'BIG,' which is set to premiere on March 30.