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.
Wait, maybe the user is referring to a different term. Let me check the spelling: "Year Girl". Maybe it's supposed to be "Ever Girl"? That's a concept from Everglow, but that's a group with a darker concept. Alternatively, "Year-End Girl" might refer to a girl chosen as the year's best, but not a group. 15 Year Girl Hot Sex Video
Therefore, I'll go ahead and write a write-up about IVE's filmography and popular music videos, explaining the confusion with the name "Year Girl" and proceed with the assumption that it was a typo or miscommunication. It's important to note that in the write-up as well to clarify the possible confusion. Alternatively, maybe it's a reference to a song