I Picked up the Amnesiac Boss, Who Turned Out to Be the Missing Ancestor of the Immortal Sect.

The abandoned true daughter Xueye got married to a beggar who had lost his memory in a flash marriage. The next day, the whole sect knelt down to welcome the beggar back to his throne - the ancestor of the immortal sect who had been missing for hundreds of years! Her ex-husband was heartbroken and frightened by his fake daughter, and overnight she transformed from an abandoned wife to someone who the whole world of cultivation would shout "Master Grandma". From then on, she cheated all the way, gained love, power, and spiritual stones, and she was so happy!