Heartbreaking coordinates (4,12)

{Sehun's Military Discharge Commemorative Artwork - 002} Do you know the saying that going to Gyeongbokgung Palace makes your heart ache? Jiyoon and Sehun, both majoring in history and culture, unexpectedly teamed up to explore the palace. Every time they walked through the palace together, their hearts sank. Whenever they walked along the stone wall path of Deoksugung Palace, strange things began to happen, making it impossible to pass. Now, they were even having flashbacks in their minds. What