Alternatively, maybe it's a reference to a song title from a girl group where "Year Girl" is part of the concept. Let me check. For example, maybe in a group like IVE, Aespa, or NewJeans. For example, IVE's song "Ive" has the concept of "I've loved you" which could be misheard as "Year Girl". Alternatively, maybe they have a music video that's referred to with a concept like that. Let me check.
Nurturing Love and Sprinkling Care, Naturally.