I write to you regarding my murder of your son. Older brother Yuchan excels in his studies. Younger brother Yujae shows no interest in school. Their mother Jiwon is relieved when Yujae starts opening up to his tutor, Mira. But one day, Jiwon receives a shocking letter from Mira: "I write to you regarding my murder of your son." (Source: Manta)