When twenty-seven-year-old Yeon-hwa loses her grandmother, enigmatic proprietor of the Hwawoldang, she decides to respect her wishes by keeping the store going for at least a month, between the hours of 10pm and midnight. She has never learnt to make the traditional desserts herself, and hopes to learn more about her grandmother.

On her very first day at work, she is soon interrupted by one of her grandmother's most regular visitors, who hints that Hwawoldang is no ordinary pastry shop, and its customers not entirely alive...

With each new customer at the store, Yeon-hwa is taken into their memories - but will this bring her the closure she craves, and continue her grandmother's legacy of aiding those left in the land of the living?