[Stand-in gag + Marriage first, love later + court intrigues]
A contract is limited to three years.
She enters the palace, and he guards the northern border, and neither owes anything to the other.
But why is the portrait in his study exactly the same as hers?
The inscription he wrote - "I have been looking for you for ten years, but I don't know your name" - who is he looking for?
Later she found out,
The year she blocked his arrow, the person he had been looking for for ten years was right in front of him.
The night she thought she was a substitute, he said to the portrait: "Mother, my son has found her."