[4] The plot concerns a murder in 2002, during the summer,[2] of 18-year old Kim Hae-on,[1] a student in high school whose body is found in Seoul.
[2] Police interview Han Manu and Shin Jeongjun, the former someone who works to deliver goods and the latter affluent, but cannot prove either had killed the victim.
[1] The perspective switches between Kim Da-on, the younger sister of the victim; Sanghui, who attended school with Hae-on; and Yun Taerim, another classmate.
[2] Arianna Rebolini of Vulture stated that the plot primarily focuses more on "the motivations of those consuming the" narrative of the murder rather than the perpetrator and the victim.
[2] Oyinkan Braithwite of The New York Times wrote that the characters "exist more as vehicles through which the story is told than as flesh-and-blood individuals.