Yoon Seo-young

Hae-jin, 29, struggles to adapt to life in Seoul and returns to her hometown of Jeju. There, she reunites with her mother, Ok-ran, and her grandmother, Kang-ja, who has spent her life as a haenyeo. Hae-jin decides to become a haenyeo, but Ok-ran strongly opposes it. The conflict between them intensifies, while Kang-ja is diagnosed with dementia.

Chi-ho, a genius confectionery researcher who has developed addictive flavors, experiences a sweet change when he meets Il-yeong, a call center worker at a loan screening company who thinks optimistically about everything, and goes through sweet changes.