On their second mini album, girl group Hearts2Hearts continued the transition from the easy-listening groove of songs like 2025 debut single “The Chase” and “FOCUS” to a more buoyant, classic K-pop sound. Lemon Tang, like the summer season that inspired it, is full of upbeat melodies. The mini album’s title track is a dance-pop song comparing the sharp bite of a lemon to the sour-sweet experience of summer attraction. While “Lemon Tang” sets the scene, tracks like “15-LOVE,” “Baby Steps,” and “heart emoji (♡)” build on the sweet, nostalgic sound, connecting Hearts2Hearts to earlier generations of K-pop girl groups, including SM Entertainment sunbaenim Girls’ Generation and Red Velvet.