When did King Li Huowang's cassock become popular?

Performed the song "itaewon Class". Li Huowang, Korean singer and actor. In the song "itaewon Class" performed in the variety show "Infinite Challenge", he wore a red robe. The performance of this song was broadcast on February 22, 2020, when King Li Huowang wore a red robe and sang this song with other performers. Because of the high ratings and influence of the performance, this red Taoist robe has also become one of the representative costumes of Li Huowang.