Premise: Hi! Pristin (stylized as HI! PRISTIN) is the debut mini-album by South Korean girl group Pristin. It was released on March 21, 2017, by Pledis Entertainment, and distributed by LOEN Entertainment. The EP consists of six songs, including the singles "Wee Woo" and "Black Widow". In order to promote the album, the group performed on several Korean music shows.
Hypothesis: The album was released on the twenty-first day of the month.