Reborn as My Ex-Husband's Great-Grandmother

In her previous life, Ming Yu never understood why Pei An married her. Only after marrying him did she realize that he had taken her as his wife simply because her face resembled that of the woman he cherished in his heart. Pei An wanted her to be a stand-in for that woman. Ming Yu loved wearing bright colors, so Pei An burned all her old clothes and allowed her to wear only plain ones. She loved joking around, so Pei An forbade everyone from speaking to her. As she lay dying, she put on plain clothes and leaped from a tall building right in front of Pei An. Her blood dyed the clothes a brilliant red. Reborn, Ming Yu returned to the time before her brother's accident and saved him from the lake, where he had drowned in her previous life. Meanwhile, Pei An waited and waited by the lake where he had met the woman he cherished in his previous life, but the girl in white, standing by the water and weeping, never appeared. He asked to marry Ming Yu again, only to discover that she was engaged to his third great-uncle. Pei An: "!!" I just recognized the woman I love, and now I'm her great-nephew-grandson. What do I do? Ming Yu, delighted to have her former husband as her junior: "Come here, dear great-nephew-grandson. Your great-grandaunt will dote on you." Pei Yong: "A Yu, I'll teach him a lesson. You only need to dote on me." Don't worry about the male lead's age. He was born late in his father's life, so he's high in the family hierarchy, but he is definitely not an old man! No angst, just a sweet, indulgent power fantasy! And the ex-husband gets a little torment, too. This is a fictional setting, so please don't nitpick the history. Theme: