The Prince Regent's Beloved Wife

She is the pampered seventh daughter of the Nalan family, but due to her frailty as a child, she had to go to the frontier with her uncle to seek medical treatment. He joined the army at the age of ten and was crowned king at the age of fifteen due to his outstanding military exploits. They met on the border and he became her doctor. After spending five years together, he could never let her go. "Your second life was given by me, so you are mine." A certain cold prince finally couldn't bear it anymore... But in this era when everyone is in danger, there are unforeseen circumstances, so what will be their outcome in the end?