The boys were listed on Billboard's '21 Under 21' list for 2015. The site describes their success as, 

If Seventeen doesn't become the biggest K-pop band of all time, it may go down as the largest. The group boasts 13 members (average age: 17) hailing from South Korea, China, and the United States, and it's divided into three units: one for hip-hip, one for vocals, and one for choreography. The divide-and-conquer strategy has paid off, as Seventeen's sophomore EP, Boys Be, debuted atop the World Albums chart in September. Led by the single "Mansae" -- a chipper mix of hip-hop, funk, and pop -- the five-song set followed 17 Carat, a promising debut that reached No. 8 on the World Albums chart back in May and outlasted records by better-established rivals like EXO and BTS. Although Seventeen was formed by Pledis Entertainment and launched via a reality series called Seventeen Project: Big Debut Plan, the group's members actively contribute to the writing and production of the music -- a rarity in the K-pop scene. Seventeen is a small army whose weapons include talent and creativity. If any K-pop band stands to truly conquer America, it might be this one.

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The boys stand at #18 on the list and while it feels like something of a missed opportunity for them not to have placed at #17, this is such a great achievement for Seventeen! Congratulations!

Thanks to everyone who sent this in!