When Sieun transfers schools after brutally avenging his comatose best friend Suho, he wants silence-not salvation. But silence isn't what he finds. Baku and his friends welcome Sieun, but one person isn't thrilled: Baekjin, a gang leader with too many secrets and too much control. To keep an eye on Sieun, Baekjin sends in Seongje-a cold, obsessive delinquent with fists like fire and a stare that scars. But what begins as a surveillance mission turns into a volatile obsession. Every fight between Seongje and Sieun sparks heat. Every scar becomes a story. And when Suho wakes from his coma, the triangle ignites into something none of them can control. They are all toxic, broken, violent. But only two of them can survive.