It's a Chinese cartoon about ancient myths, titled "非人哉" (It means "Not a Human", and I do not know its official English title). I watched it on https://www.youtube.com/playlist?list=PL0Cq3jn9pFuXbMW2toLRGRcSB291wgkjr. However, there is no English subtitle. The video you saw is a collaboration (advertisement) with Pizza Hut.