She is a soul from another world who transmigrated from the twenty-first century.
He is the Regent of the Great Sheng Dynasty, a man with power over the court, known as “the Capital's Reaper.”
On the night they are forced to marry, he coldly tells her not to dream of winning his heart.
She smiles and says, “Perfect! We each get what we want. A pleasure doing business with you!”
She thinks this is just a deal in which they stay out of each other's way.
He falls for her quirky charm, unaware of where she comes from.
She succumbs to his clumsy tenderness, but doesn't dare tell him the truth.
When she finally says, “I love you”...
It is already in a letter of farewell...