In Korean tradition, dreaming of a sibling is read as mixed. It is most often tied to 가족, 직장.
Siblings are close allies and rivals at once. Getting on well was read as cooperation; quarrelling, friction nearby; a sibling leaving, separation or independence.
Tradition reads the symbol as an omen; psychology reads the same dream as a mirror of your present state. Describe your dream and both readings appear together. Interpret your dream