finally i finished reading the novel. after comparing with some vids from reuters, they changed some plots. I think in the drama leads have more time together than in the novel
GYZ is the most soft spoken husband, despite being in high tension life, he manages to be gentle to his wife, never using high tone when talking with her, except when he forbid his wife for getting involved in his mission . This drama has limited skinship but the soft spoken husband makes fall in love.