I still get a little giddy when I want to sing along to 'Black Mamba'—so I hunt down the cleanest lyric source every time. My first stop is usually the artist's official channels: the SM Entertainment site, the group's official YouTube channel, or the official music video description. Often the official upload will include the correct Korean lyrics (and sometimes an English translation) in the video description or subtitles. When I commuted and tried to learn the exact timing of the chorus, Spotify's real-time lyrics feature saved me—it's synced and makes practicing so much easier.
If you want annotated lines or fan translations, Genius is my go-to for context and explanations; people break down lines and note references which is fun if you like cultural background. For quick plain text copies, websites like AZLyrics, Lyrics.com, and MetroLyrics tend to host the song lyrics as well, but watch out for ads and occasional transcription errors. If you need the original Hangul and a romanized version, Korean music portals (Melon, Genie, Bugs, Naver Music) are the authoritative sources, though some require region access or sign-up. I also sometimes use Musixmatch for synced lyrics across devices.
A couple of practical tips: search with quotes like "aespa 'Black Mamba' lyrics" to narrow results, check the official video captions for accuracy, and compare a couple of sites if a translation feels off. I usually keep a screenshot on my phone for practice, and remember that supporting official streams helps the artists—plus the official sources usually have the most accurate lyrics. Singing the bridge perfectly still makes my day, honestly.