Yin Yang Hot Pot Restaurant

I bought a hot pot restaurant from my second uncle, but my second uncle told me that we can't order Yuanyang Hot Pot for customers after twelve o'clock! After I took over the hot pot restaurant, my outlook on life began to collapse... Due to negligence, I ordered mandarin duck pot for a couple, but I saw in the newspaper the next day that the couple died! The cause of death was that they committed suicide by jumping off a building together! Then at twelve o'clock every night, a strange couple would appear in my hot pot restaurant, and they would ask me to make them a mandarin duck pot...