Novel Tale, a changeling living in Canterlot as a writer, has his peaceful life shattered when changelings from another hive attack, revealing the existence of changelings to all of ponykind. And his last book had a changeling character in it...
Silent Knight assumed his story would be complete once he achieved his dream of joining the Royal Guard. To his surprise, it was only just the beginning.
The portal between Earth and Equestria has been open for 5 years and cultural exchanges have started taking place in earnest. One of these exchanges is sending ponies to human institutions for higher learning.