1x4 - Summer Vacation

Ha-yeon and Yu-gyeom return to their normal lives. Sae-ryeong, who was seriously injured, also returns to school, but a group of students begins to grow suspicious of her identity. When they discover that Sae-ryeong and Yu-gyeom have broken up, they start digging into her past. Despite Sae-ryeong's best efforts to keep things under control, her long-kept lie is eventually exposed.