A supporting role's immortal way

30-year-old Yenny somehow travels through into a book as a 12-year-old girl supporting role of the same name.
Her third-rate lifeblood just meets the minimum requirements of the school's selection for her to enter into the Cloud school which has been ranked the top among all schools for its excellent magic teachers, standing long history, and the best spell books in this cultivation world.
Yenny, however, performs impressive in the test of heart road, and is rewarded by the principal of Cloud School with a storage ring. Because of her special bloodline, she activated a drop ancient God blood sealed in the ring space, thus, obtaining the inheritance of the ancient God clan.
What can Yenny, as the supporting role who is about to die in the third chapter of the book, do to escape from her death and take the road to immortality?