Group AtHeart (AtHeart) held a release showcase for "3! 4!" and a multi-form drama production presentation at the Rise Autograph Collection in Seogyo-dong, Seoul, on the afternoon of the 19th.
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!," depicting youths from different eras racing toward the same dream.
AtHeart Nahyun performs "3! 4!" on stage. Aug. 18, 2026
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