After Transmigrating into a Book, I Ran Off with the Heroine

[Transmigrate into a book + period setting + pocket dimension + family life + get rich + lighthearted + sweet romance + one-on-one] Yu Xin transmigrated into a period novel with her pocket dimension. When she turned around and saw her poor little cousin, Yu Xin took her by the hand. “Why bother fighting those awful people? Come to university with me!” “What? The female lead's surrounded by awful people?” “Watch this.” She slapped one of them across the face, then turned to her cousin. “Learn anything?” Using what she knew from her past life and her pocket dimension, Yu Xin helped her family get rich, start businesses, and buy houses, occasionally giving the awful people a taste of their own medicine. Life was wonderful.