How do you identify a person with deep shrewdness? Psychology: just look at these 3 points

Shrewdness is actually a kind of psychological manifestation. The reasoning is actually very simple: in life, no one likes dealing with a person who is deeply shrewd. If you are forced to keep in touch, you will only go along with the "performance" as if watching a show, while inwardly finding it ridiculous and hard to accept.
I wonder if everyone has had this feeling: interacting with a person who is deeply shrewd always makes you feel at a loss and impossible to figure out. If you are relatively dependent yourself, then this person will also make you feel insecure. From a psychological perspective, a person who is deeply shrewd often shows these 3 behaviors. Once you understand them, you must be careful and guard against them.
First: friendly to others, but never truly opens their heart to anyone
A deeply shrewd person generally appears very friendly and amiable to everyone, but the important point is: you never know what they are thinking inside?
What must be reminded here is: although a shrewd person will not easily form deep friendships with others, they do so to protect themselves, always believing that no matter what it is, only they themselves can complete it, that they can rely on no one and do not want to rely on anyone!
Second: rarely shows their inner emotions
A truly deeply shrewd person often conceals their emotions and will not easily reveal them in front of others. You never know that while they appear strong on the surface, inside they do not know how much bitterness and how many tears they have endured.
They know how to protect themselves by staying calm and unruffled. Many times it is real life that makes them no longer so impulsive, no longer so foolishly at the mercy of others. Those who can be called deeply shrewd all know: "Silence is golden, stay calm and unruffled."
Third: cautious, thorough, always leaving a way out
As just said, a deeply shrewd person always leaves themselves a way out in everything they do. They will not lose their head and lose themselves because of a small immediate benefit. As long as there is the slightest change in the surrounding environment, they will immediately become alert and make ample preparations to face all the unpredictable things that may happen next.
Actually, what the editor wants to tell everyone is: shrewdness does not mean scheming. In order to survive in this realistic world, many people develop various defense systems for self-protection. What you only need to understand is: although the shrewdness is deep, if others do not provoke me, I will not provoke them!