Please recommend a novel about traveling through ancient times.

I don't remember the exact details. I only remember that the man had something to attend to and left. He asked the woman to wait for him. However, the woman left and left a line of words on the ground. It seemed that she wanted to go home for dinner. The man was extremely angry. There was also the scene where the woman saw a mountain painting drawn by a certain man in the academy and said that the painting was wrong. She bit her finger and dripped a few drops of blood on the painting, becoming the sun to add color to the painting. Oh, it seemed that the woman had returned to the modern world due to an accident or something. She missed the man and searched everywhere for information. She wanted to know what the man's life was like in ancient times. She knew that the man did not inherit the throne in the end and died in the battlefield or something. She cried her heart out. In the end, the man also transmigrated to the modern world and reunited with the woman.