The debut song "BUTTERFLY" is a superb R&B song with a luxurious production team including producer Matt Cab , DJ UPPERCUT top line, Nijiiro Samurai Zuma, and Oriya Fujita. In the lyrics, it is also written as "butterflies," and it is also used to mean the emotional feeling of "throbbing in the chest" or "throbbing," expressing a sweet and sad love.