AtHeart is making a musical comeback with the release of the single '3! 4!' on August 19 and will perform at the iHeartKPOP with JoJo LIVE Series in Los Angeles. The artist also unveiled the single 'Say It' as part of the 'Time Travel Project,' featuring a playful music video that reimagines The Cardigans' 'Lovefool,' following a series of teasers and concept visuals.