In Korean tradition, dreaming of a friend is read as auspicious. It is most often tied to 애정, 전반.
Friends stand for affection and news. Seeing someone you have not met in years was taken as a sign that word from them is coming; in practice it also revisits who you were back then.
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