The Castellan Belongs to Me

Wu Lin, a modern day freelance writer, agrees to help a friend finish their novel, but because she dislikes all the palace and harem intrigue she decides to take the plot in a completely new direction, and soon finds herself traveling into the book! Here she is now Wu Yu Lin, the arrogant and unwanted wife of Song Wei, the Lord of Donglin City.
As Wu Yu Lin she begins to attract Song Wei's attention with all her newly
strange, "abnormal" antics; she even rescues him several times and they begin to fall for each other. But as Song Wei's brother Song Yi, who has always coveted his position and power, starts to mount his attack, will Wu Lin be able to help rewrite the ending?
(Source: Jwells at MDL)