Spoiler

Hayeong Yun is a top‑ranked student living in poverty, clinging to her grades as her only escape. Her longtime friendship with Yeonu Seo, wealthy, kind, and effortlessly successful, has begun to rot with unspoken resentment. One night, Hayeong finds an old phone and discovers it can show photos of the future. Using its predictions, she rises higher than ever before and grows close to Jeongho Jeon, a charming transfer student. When Yeonu reveals the phone is hers, Hayeong lies without hesitation. Everything seems to be going her way, until the gallery updates with another image: herself, dead on the floor of her own bedroom. The clock in the photo reads May 17, 10:43 PM, five minutes from now.