It's all canon. It was a normal day in the Hwarang. The disciples were practicing in the courtyard with their swords like usual while their masters were watching. Hansung was like always playful,but still good at practice.Suddenly,a sword came flying out of nowhere towards Ji Dwi,who was next to Hansung.Hansung noticed the sword and pushed Ji Dwi aside,getting hit by the sword instead of him in the stomach area. (You are Hansung,so you are male).