does anyone know the title to this bl manga, there is this guy that works as a janitor in ...

does anyone know the title to this bl manga, there is this guy that works as a janitor in a company, he is very quiet and anti social i think, i also can't remember whether he's mute or just anti social thats why he doesn't interact much with others... then there is this "popular" employee like he is well liked by others cause of his personality... and one day it was raining and this guy lent an umbrella to the janitor guy (or the other way around) and they started to interact more with each other.... i think the plot is something like that, I've come across this manga sometime ago ( 2 yrs ago) it was still ongoing before and i forgot the title nowwww