People Are Being Devoured, I Became the Lord of Time Dao

Jiang Chen traveled to the world of Devouring Stars 18 years ago, but God seemed to have played a joke on him for the second time. This time, both his parents were still dead, but the difference was that he had a seriously ill sister. In order to cure the disease, Jiang Chen had to study hard while being a tutor in high school for three years. Thanks to Jiang Chen's status as a senior student, he also made a lot of money in three years. However, when he was about to take the college entrance examination, the hospital issued an ultimatum... (No system, there are plug-ins, and there is a female protagonist)