Titans of the Tang Dynasty

Someone plotted against him in his previous life. Li Yin accidentally fell from a high building and died. After waking up with this memory, he found that he had returned to the Tang Dynasty and was reincarnated into a child from a poor family. He never thought that he was inextricably related to Concubine Yang! It turns out that Concubine Yang also has a beautiful younger sister. Because she doesn't want her to get involved in royal disputes, she has been secretly raised by her family's cronies...