It sounds like you are referring to the 2020 South Korean television drama (original Korean title: Gajjiga Goyo ), starring Park Min-young and Seo Kang-joon.
There, she reunites with (Seo Kang-joon), a quiet, introverted bookstore owner. Unlike the aggressive male leads common in 2020 dramas, Eun-seob is a gentle soul who lives a routine life: running the "Goodnight Bookstore," posting on his monthly blog (titled When the Weather is Fine ), and observing the world from a safe distance. He has been secretly in love with Hae-won since high school.
As the winter season passes, the two reconnect and begin to melt the "ice" around their hearts, helping each other confront deep-seated wounds from their pasts. Key Characters Lee Jae-wook
Once you find the drama on Netflix or Viki, ensure your with English subtitles . Do not use the English dubbing, as it strips the performance of Seo Kang-joon’s trembling voice and Park Min-young’s tearful whispers.