Recommandations

Both use poetry and symbolism to further the storytelling.
Both explore the melancholy and regrets of the MCs. The way both movies are shot gave me the same calm but also shattering atmosphere around the MCs.
Both portray LGBTQ+ relationships.
Moonlit Winter also depicts the MC’s relationship with her family.

The Chinese movie 'Love Life Light' and upcoming Korean series 'Light Shop' are the adaptations of webtoon "Shop of the Lamp" by Kang Full.

"Serendipity's Embrace" involves a storyline where the female lead (FL) ends up with the male lead (ML) despite the FL's best friend having a crush on the ML, it does share a thematic similarity with "20th Century Girl." In "20th Century Girl," the FL also deals with a complex love triangle involving her best friend and the ML.

One is the movie, the other the mini drama sequel.
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They both are similar because there is a secret romance between two coworkers at work. They both deal with gossips from other co workers.

Both have a romance between a poor but talented chef who works in the palace kitchens and a royal. Both have a similar pacing and feel, as well as a palace setting.