No, he is not Lie.

Lie is not his real name, but a false name he took as a temporary refuge. His real identity is the only son of the current president and the president's wife of country A, and he is a very important member of the royal family of country A.

Compared with the two sons born to the ex-wife of the president of country A, the third son is young, but he is calm and dignified, and is deeply liked by the president of country A.