K-pop rookie group Hearts2Hearts is continuing their upward momentum with their new song 'RUDE!' as they begin their first comeback activities this year. The group set a record by winning 9 rookie awards last year, the most among 2025 debut artists, and successfully held their first fan meeting in February with all seats, including obstructed view seats, sold out. The new track 'RUDE!' is a house genre song with a bold and upbeat atmosphere, featuring an addictive melody that captures the team's unique identity. The song has topped various music charts including ranking 3rd on Melon TOP100, achieving number 1 on HOT100, and winning first place on music broadcasts. Globally, it secured the top spot on Spotify's Korean Daily Top Song chart, Apple Music's Korea TOP100, and ranked first on China's QQ Music's new release, trending, and K-pop weekly charts. The music video surpassed 57 million views, marking the group's highest record. In their stage performance, the group showcased new charm by adding a free-spirited atmosphere to their existing precise choreography, maximizing the advantages of their even-numbered, multi-member lineup with formations like 4v4 large arrangements and X-shaped formations. They also maintained momentum in short-form content, securing the top trending audio on Instagram, 660 million views on TikTok, and 89 million views on Douyin. Original content including 'Hatz Bulgama' (approximately 1.3 million views) and 'Black and White Patisserie' parody (approximately 1.6 million views) also garnered positive responses, solidifying Hearts2Hearts' position as a powerful rookie group.