Rookie girl group AtHeart is gearing up for its first comeback since debut, teasing a dramatic shift in concept.

On January 29, the group's agency Titan Content released a motion teaser titled AtHeart: The New Black on AtHeart's official YouTube channel.

The roughly 30-second clip hints at a new direction, visualizing each member's distinct emotions and individuality through a "black heart" motif.

A striking visual overhaul also stands out. Departing from their previously lovely image, AtHeart adopts all-black styling, projecting a chic and refined mood that heightens anticipation.

The teaser further includes comeback spoilers. English text referencing February and March appears at the end, signaling that full-scale comeback activities will take place during this period in the first quarter of 2026.

AtHeart debuted in August last year with their first EP Plot Twist, earning attention at home and abroad for their unexpected sound and performances.

The group has steadily built global recognition through overseas appearances, including a rapid entry onto Good Day New York and performances at the Grammy Museum's Global Spin Live series.