Group AtHeart (AtHeart) held a "3! 4!" release showcase and multi-form drama production presentation on the afternoon of the 19th at RYSE Autograph Collection in Seogyo-dong, Seoul.
AtHeart (Michi, Arin, Katelyn, Bom, Seo-hyeon, Aurora, Nahyun) expands its universe with the second single of the "Time Travel Project," "3! 4!," and the time-slip adventure drama "3+4!," portraying youths from different eras running toward the same dream.
AtHeart Nahyun poses for photos. Aug. 18, 2026
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