What does "I was originally a isatis root in the mountains that can cure all diseases" mean? What is the source

Since the fantasy idol drama "Gu Jian Qi Tan" was launched on Hunan Satellite TV's "Diamond Exclusive Theater", the ratings and topic attention have remained high, and the starring role in the drama has become extremely popular.

Compared with the high attention, "Gu Jian Qi Tan" is full of "light spots". In the plot broadcast the night before, the much-anticipated thousand-year-old demon "Isatis" finally made his domineering appearance, and under his protection The vine demon below also staged a vigorous human-monster battle with Su Su and others.

After the drama the day before yesterday was broadcast, the term "Thousand-year-old Isatis root" not only became a hot topic, but also a classic line in the play "I was originally a isatis root in the mountains that can cure all diseases" also triggered many Netizens collectively ridiculed it, with many fans saying "I want to talk to the screenwriter about life", and even the words "Hello, I am xxx who have been practicing for thousands of years" frequently appeared. It has become the most popular trend this week. sentence.