Mien is a term used to describe a person's manner or demeanor. It is derived from the German word 'mein' which means 'MY'. MIEN is often used to describe a person's outward appearance, such as their facial expression, body language, and overall attitude. It can also be used to describe a person's inner character, such as their values, beliefs, and personality. MIEN is an important factor in determining how people perceive and interact with each other.