I can find so little empathy with any of the main characters here and the two twisted ones and twisted psychological plot complications become almost hilarious。 I assume the metaphorical grey box refers to the emotions swirling inside them and the apartment box in which they all live and breaking out of it、 however for me the ending is hardly credible。 as for the misleadingly tagged LGBT theme I was looking for、 it was so minuscule it almost escaped my attention〜 if you are looking for a dorama with this as a meaningful element don't waste your time。a dull grey box indeed〜