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Lin Kun, an old village doctor, became crazy because of the pain of losing his son. Fortunately, his daughter-in-law never left him and wanted to take care of his father-in-law until he died. On this day, Lin Kun got a blessing in disguise and received the inheritance of the ancient alchemist Yin Yang Taoist. From then on, his destiny changed drastically. Not only is he getting younger, but he also vows to uncover the true culprit that caused his son's death. Of course, he also wants to help his daughter-in-law and all the villagers get rich and live a happy and carefree life.

He traveled through time and became Xu Xian, determined not to be a weak pretty boy who would drag his wife down, and obtained the [Change Life System]. As long as there are changes based on the original owner, you can get rewards. Wonderful medical skills save the common people. Invincible magical power, slaying demons. ........