Four years ago, Minjun shattered Sooyoung's heart and left her to rebuild a life that no longer included him. Now, she's traded small-town dreams for a high-powered Seoul career, determined to keep her past locked away. But when a record-breaking blizzard forces her to take shelter in her aunt's remote mountain cabin, she's met not with solitude-but with Minjun himself, standing in the firelight like the ghost she's never been able to outrun. The storm outside seals every exit. The storm inside threatens to break her in ways she swore she'd never allow again. Trapped together, every word drips with unfinished business, every glance unearths memories she buried deep. And when a long-hidden truth about their breakup surfaces, Sooyoung realizes this isn't just a coincidence. This Christmas, snow isn't the only thing falling-walls are, too. And once they're down, neither of them will ever be the same.