Where did the legend of the cuckoo meet the cow?

Next to the cuckoo's house. According to the video information inquired by Watermelon, A Niu, a god, was found after crossing mountains and mountains. A Niu gave Arrow the key and told him that there was a cuckoo's house in the sky. Then people found the God A Niu. Arrow came to the water with the key and asked Omar to take Luo Fei to the sky.