Yuna wasn't as naive as they think. or a one-shot au where Yeji and Ryujin tries their best to hide their budding relationship to the other members but ultimately failing because they underestimated Yuna's inquisitive perception of things.

Shin Ryujin is a worldwide famous musician, frontwoman of her own band, with her friends Yuna at the drums and Chaeryeong playing bass. After some years, she gets the courage to release a song for the girl she loved, whose name she can't remember. Inspired by Green Day's song ''Whatsername''