When NOX Entertainment announced the debut of a new girl group called SIREN, the reaction was immediate curiosity. The name alone felt different from the bright, trendy concepts dominating K-pop at the time. It sounded darker. More elegant. Dangerous, even. Their first teasers only deepened the intrigue: black oceans under moonlight, distorted whispers echoing through the background, silver jewelry sinking beneath water, and five girls standing motionless like figures from a myth.