In her previous life, Su Shishao was the legitimate daughter of the Prime Minister. She was favored by thousands of people throughout her life. She also tested the true spiritual root at the Lingyun Sect's disciple recruitment conference. Her unpopular sister Su Yutong even tested the heavenly spiritual root. Both of them were accepted by Elder Lingyun as his direct disciple. She stole the show. Everyone said that two geniuses came out of the Prime Minister's Palace and their future was limitless... (But Su Shishao saw Su Yutong's proud smile, which made her feel a little strange)
Three years later, Su Shishao disappeared mysteriously. People heard about her again, only to learn that she had become a demon and was beheaded by Ouyang Ruifeng, a disciple of the Xianyun Sect...
Three months later, Su Shishao suddenly woke up from her dream. She returned to the day before the Lingyun Sect's disciple recruitment conference...
Idea: Who is the murderer?