When the evil and unscrupulous biochemical doctor traveled through time and became the gentle and good sister Maozhihuaretsu,
When you find out that this good eldest sister is the ultimate boss who confronts the Soul King
When you find out that your best friend turns into the ultimate slut
I believe you will collapse
(The heroine in this article goes from weak to strong, her character is unclear, and the plot falls apart. You will understand what happens next...)
The last sentence is that I am incompetent.