Group AtHeart held a release showcase for "3! 4!" and a multi-form drama production presentation at the RYSE 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 running toward the same dream.
AtHeart Seo-hyeon performs "3! 4!." Aug. 18, 2026
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