[IDOL! XIAO x PIANIST! READER] After such a long time of loving 4NEMO, Y/n gets to meet her idols after one of their concerts. But of course, something has to go wrong. Because of the "incident", Xiao ends up with Y/n's number and a promise to do any favors he asks of her. And after Sucrose quits, 4NEMO is left without a pianist. Recalling the fact that Y/n had Xiao give his signature on a music sheet, he figures out what favor she can do for him.