Group AtHeart held a release showcase for "3! 4!" and a multi-form drama production briefing on the afternoon of the 19th at the RYSE Autograph Collection in Seogyo-dong, Seoul.

AtHeart (Michi, Arin, Katelyn, Bom, Seo-hyeon, Aurora, Nahyun) is expanding 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 performs "3! 4!". Aug. 18, 2026

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