[Completed] Liu Jiajia was born into the body of the eldest princess of the Kingdom of Heaven with the memories of her previous life. Just when he was thinking about having a prominent status in this life and finally being able to eat well and live a peaceful life, he discovered that his father's throne was not stable, and there were internal and external troubles. She can't resist foreign enemies, but she can help her father farm and feed the population. Besides, she has nothing to fear because she has a system, so she just does what she says.
