This is Pierce in his younger days. Right after the his mentor was murdered and he recieved his scar from Sarya, he wandered out in the streets dazed from the loss of blood and collapsed not knowing where he was and blacked out. By the time he woke, he found himself on a bed with bandages on his face. Then a girl came in with food for him to eat and clean bandages to change his blood soaked ones. By the time he saw her he was in awe. The girl greeted him a good morning and told him her name was Rosemary. From that day on Pierce was madly in love with her but really has no way of showing it.
By the way Pierce was actually born somewhere in the 19-20th century, so it would actually explain Rosemary's outfit.