Looking for a Crossover Story Featuring Multiple TV Dramas

The female lead keeps transmigrating to complete missions. At one point she goes to the world of Three Lives, Three Worlds, The Pillow Book, where her love interest is Donghua. In the end, Donghua becomes the Heavenly Dao of another world. The female lead goes through many lifetimes of tribulation, and Donghua eventually takes her away. She transforms into a cloud in his world.