In the previous life, he was Yuan Ye, and he was Shang. He practiced medicine to help the world, and he followed them quietly. One was a small locust flower, and the other was the supreme king of the demon world, destined to be separated by life and death. Later, she was Dongfang Yu, and he was Liu Shang. She drank the flower dew and forgot about her love. He has been searching for her for hundreds of years, and just wants to renew his relationship with her...