Based on the traces of images, Hae In brings Oh Soo to his high school. And in front of the fearful Oh Soo stands Mo In Ho, the high school teacher of Oh Soo. Mo In Ho receives a suspucious mail too. They look for Gwang Doo. Gwang Doo begins to have a different view on the case. After meeting Young Chul, Mo In Hoasked about the mail from an unknown sender. Young Chul claims that he doesn't know anything. Oh Soo is back to his high school again. Memory of the past gives him of endless pain and suffering, so he decides to resign from the team. (Source: Viu)