Gunna generally plays it cool, slithering through performances and videos with an icy calm that matches the downbeat, melodic vibe of so much of his music. But in October, onstage at the BET Awards, performing his top 5 hit, “Drip So Hard,” alongside his partner-in-crime, Lil Baby, he let his mask drop for a moment and broke out in a toothy grin. He didn't realize it at the time, but the moment was a real landmark for the young Atlanta rapper.