One hundred and twenty strangers suddenly find themselves trapped in a mysterious city with no memories of how they got there. With no way to escape, they are forced to participate in a deadly game where, every midnight, someone disappears.As fear spreads and the number of contestants slowly decreases, alliances are formed, betrayals begin, and hidden secrets start coming to light. But in a place where nobody can be fully trusted, even love becomes dangerous.Because among the 120 contestants, someone is hiding their true identity……and someone is secretly controlling the game.Who could that be?

At Haneul Academy, where wealth and status determine everything, quiet scholarship student Han Seo-yeon becomes the target of relentless bullying. Determined to endure it alone, her life takes an unexpected turn when she catches the attention of Kang Min-jun—the school's cold, untouchable heir who seems incapable of caring for anyone.As rumors spread and hidden secrets slowly come to light, strange memories begin to resurface. Beneath the falling cherry blossoms lies a forgotten connection, a promise lost to time, and a past that neither of them remembers.But some memories never truly disappear.And some hearts never learn to let go.Will they uncover the truth hidden beneath the cherry blossoms, or will the past tear them apart once again?