Chief Military Counsellor Son-in-law

*As the eldest daughter of the great family She had a dumb husband. Even though he was so handsome that no one could find anything wrong with him. 
His actions were also very refined and impeccable. However, She was still not very satisfied with this husband.  
The husband and wife had been together for three years, and this relationship had not warmed up yet. 
She had been with him for three years. 
In these three years, he had never said a single word.
she had always felt that she could not see through him. 
She did not even know whether he was happy or sad. 
Until tonight everything has changed?
How was this Dumb husband suddenly became the Ultimate Husband? Who is he？