Ghosting, Manipulative, Controlling, Self-doubt
Roo-yung is Korean for ghost. With an androgynous look Roo-yung lures others in, developing relationships and then suddenly cuts them off, ignoring them; refusing to communicate, going dark, abusing their trust and goodness.
Roo-yung embarrasses victims, undermining their self-confidence, damaging their self-esteem, making them think they are worthless. Ultimately this can lead to grief for the loss of someone, even though that person was never actually truly friends towards them and can even cause depression.