Woo Ga On leaves Luna and hides. Everyone except Tae In tries to search for him. Yoon Joo and Woo Yeon finally find him and Yoon Joo tells Tae In where he is hiding after finding out that Tae In is as worried about Ga On as they are. Tae In tries to solve this problem and therefore goes to find Bluemoon's No Sang Hoon and sees the video of Ga On hitting Sang-Hoon in high school. (Source: XieLalisa at MyDramaList)