The title refers to a few different productions from that year, but based on your description of it being a "series," you are likely referring to the South Korean BL (Boys' Love) drama . Happy Ending (2020) - Series Overview
: A major critique is its runtime. At only 20 minutes total (divided into three short parts), reviewers noted that the story feels more like a "prologue" than a fully developed narrative. @Master_Webseries Happy_Ending (2020) S01E01.mp4
: The story begins with the protagonist, Hyun , discovering his old "heart" diary. As he reads through it, the episode transitions into a series of flashbacks where he reminisces about his high school days and his secret, unrequited crush on his best friend, Dongho . Main Cast : Kim Seong Hyuk as Dongho Park Jun Mook as Hyun Deep Review: Strengths & Weaknesses The title refers to a few different productions
If you aren't referring to the Korean BL series, you might be looking for: : The story begins with the protagonist, Hyun