Someday I Never Knew (Official)Nếu ngày đó chúng ta chưa quen biết / Weiceng Zhixiao de Na Yi Ri / 未曾知晓的那一日 / 천 마디 말보다, 너 / 천마디 말보다 너

A lot happened that day An older brother flees with the adopted younger sister. The two survive with only each other after getting labeled as The Murderers Children. In those days where they accompanied each other, the two children carried their own concerns. And during someday no one knew, they developed feelings for each other