Situated at the heart of a rapidly gentrifying district of Seoul, the Yeonnam-dong Smiley Laundromat is a place where the extraordinary stories of ordinary residents unfold.

It is a haven of tranquility and reflection for locals. When someone leaves a notebook behind, it becomes a place that brings people together. Customers start jotting down candid diary entries, opening their hearts and inviting acts of kindness from neighbors who were once just faces in the crowd.

There is more to the diary than first appears, and soon the laundromat's regulars are teaming up to solve a mystery and help the notebook's former owner find peace.

A heartwarming, healing debut that captured the hearts of Korean readers, this novel explores the preciousness of human relationships and the power of solidarity in a world that is increasingly cold, fast-paced, and virtual.