Review Detail of InvalidUN in Idol Dream

I'm in the midst of exploring different genre and found this good story, kinda slow but appropriate paced for the story, uhmm I don't really know what to say about this review due to my limited knowledge about the genre, quality and plot is okay but undating stability kinda off. This is quite nice story, well I haven't read similar story tho but it piqued my interest and pretty promising, definitely recommended! I have a question, I dunno if author elaborated or mentioned it somehow but is the mask MC is wearing a whole face mask or half face mask, is it part of swan in duck clothing for his grand entrance? I don't get while he wears that one but I know it will be exciting once he was revealed.