You will gasp when you find out who your enemy is.

(Multilingual subtitles) What can you do if you understand that you have an enemy but you do not know who this enemy is?
How to identify such a person?
The hidden enemy is doubly dangerous. A hidden enemy is like a knife in the back.
The enemy may be someone close to you. It could be someone you trust. Your enemies are always people you know. Strangers will not harm you. They do not care about you or your life. An enemy is a person you always know.