Also known as: Someday I Never Knew, 未曾知晓的那一日
A lot happened that day… An older brother flees with his adopted younger sister, and the two survive together after being labeled as "The Murderer's Children." In their lonely days, they support each other, each carrying their own burdens. Over time, in the quiet moments no one knew, their bond deepens, and they begin to develop feelings for each other.