Spoiler

Ha-Yeong Yun is a brilliant student trapped in poverty, relying on her flawless academic record as her sole path to a better life. Her lifelong friendship with Yeon-U Seo—a wealthy, effortlessly successful, and kind-hearted classmate—has quietly deteriorated, poisoned by Ha-Yeong’s unspoken resentment. Everything shifts the night Ha-Yeong stumbles upon an abandoned phone capable of displaying photographs from the future. Armed with these glimpses of what lies ahead, she propels herself to unprecedented heights and forms a connection with Jeong-Ho Jeon, a charismatic transfer student. However, her stolen advantage comes at a moral cost. When Yeon-U reveals that the mysterious device actually belongs to her, Ha-Yeong denies it without a second thought, choosing ambition over loyalty. Just as her carefully constructed life seems perfectly secure, the phone’s gallery refreshes with a horrifying new image: Ha-Yeong lying dead on her own bedroom floor. The clock visible in the photograph reads 10:43 PM on May 17—leaving her exactly five minutes to escape her fate.