C604 I Am a Traveling Doctor in the Martial Arts World

Spanning a vast area, the palace with its four courtyards was enclosed by towering walls, with small doors on the eastern and western sides for the servants' use. From a distance, Lee Yun peered inside and noticed numerous guards on patrol, making it clear that a forceful entry was out of the question.

Unless, of course, he could become invisible.

While he pondered his next move