blackbox (blackbox9158), yoo joonghyuk, omniscient reader's viewpoint, highres, variant set, 1boy, alternate costume, artist self-insert, bare tree, black-vest, black coat, black hair, black suit, blurry, blurry foreground, book, ceiling light, chair, coat, cup, curtained hair, drinking straw, formal clothes, glass, glasses, holding, holding book, holding pen, indoors, male focus, name tag, necktie, night, open book, pen, pencil case, shirt, short hair, sitting, soda, solo, striped necktie, suit, table, tree, upper body, white shirt, window, winter, writing