The city is taken over. Taken over by shadows who barely left any humans alive in their wake. And even those who still live won't for long because there is no way out. No way of letting the other citys know what's happening. No way for anything but death. There was no way out for Luhan either. He was surounded and traped in the darkness. But then something came to help. Something came from the darkness. Someone.

Oh Sehun is CEO Huang Zitao's housekeeper. He is in charge of cooking the meals, cleaning, and taking care of Zitao's son, Jin. Sehun and Jin are close, closer than Zitao thinks. When Jin starts calling Sehun "Umma" in private, all Sehun can do is smile sadly - because he is only a housekeeper.