Final answer:
The Joseon dynasty was plagued by contention among the yangban elite and their refusal to resist the kings' policies. They also controlled the civil service examinations and dominated access to official positions at court. Neo-Confucianism was a source of both learning and contention, with debates on its main elements and challenges to its philosophy. Joseon scholar Yi Toegye rejected Wang Yangming's ideas, arguing that relying on one's own mind was insufficient to know virtue.
Step-by-step explanation:
The question is about the challenges faced by the Joseon dynasty in Korea. The dynasty was plagued by contention among the yangban elite, who refused to resist the kings' policies and controlled the civil service examinations. These yangban families eventually dominated access to official positions at court, leaving others out. Neo-Confucianism was a source of both learning and contention in the late 16th century, with debates on the primary elements of Zhu Xi's philosophy and Wang Yangming's challenge to it. Joseon scholar Yi Toegye rejected Wang's ideas, arguing that relying on one's own mind was not enough to know virtue.