He is in pain.
Seol thinks with narrowed eyes observing the man riding ahead of her. He holds his reins in a white knuckled grip, and his lips are pursed against any visible sign of emotion. She watches him to the detriment of her own riding that Min Ha has to ride closer and keep Woo out of pitfalls in the road.
"Pay attention mama," the court lady already rather green in face looks annoyed with her behavior.
They had not stopped after their hasty lunch and Min Ha was growing crankier with each passing mile. Shinju is far ahead - as the woman complained mumblingly - they would never reach the mountains in one day, no matter how much they rode.
Seol ignores her last string of complaints and urges Woo into a gallop, swallowing the distance Seo had put between him and the rest of the party. She catches up to him and cuts off on Woo's pace, falling into a trot beside him.