On March 24, 2026, singer Younha dropped a new post on Instagram — and it came with a cheeky caption: "Don’t call me teacher; call me Younha sunbae." In the photo, Younha stands at a table in a blue jacket. Fans flooded the comments with playful replies like "Hi, sensei," "Sensei...," and even a funny mash-up, "Younha teacher–sunbae-nim."