Do you know who sang this original song?

Does the subject want to ask, "Do you know who sang the original song?" Fox summer. According to the song "Do you know? This song is a TV series propaganda track released by Fox Summer on 20 18. "If you know, you will know" is composed and written by Liu Xuandou, and sung by Fox Xia and Yu Ke. In the same year, it was the theme song of the TV series "Do you know if you should be green, fat, red and thin?".