Retro dance is a popular disco dance in the 1980 s, which is very random The popularity of the word "retro dance" originated from the dance performed by a female artist named Bae Seul ki in the Korean variety show "Love Letter". Mainly a strong sense of rhythm, the movements of hands and legs are obviously neat, and each repetition will randomly change some patterns with the dancer's mood. Because it is simple, interesting and easy to imitate, people have the desire to imitate.