Im not really sure if its Straight or You know gay but its under Manhwa so its either straight or not in which I don't really care since I just read for the plot..... But their are sunble hints in the Novel..? Im not really sure if this is true though
"Maybe because it was directly after witnessing something truly shocking, my entire body seemed to be wrapped in this cold air. Someone took of his black coat and placed it over my shoulders"
Again it might not be Who you guys think it is so Idk maybe in the later chapters it will be revealed or atleast hinted at...