Hello there. I agree it's sad. Perhaps that is why Youth is so precious. Do you remember what DS's teacher said about youth? She said something about how they don't know how great it is.
If I compare my life with my youth, I think my youth sucked. However, life now isn't rosy and peaches. It's certainly not as loving and great as DS's youth. It really echoed to me that the place Ssang Mun Dong is now a wreck but if you visit back the memories, the place is great.
It's sad, places change, people change. Cherish your youth and your present.