How can you become an immortal if you don’t have money?

Description

Old man: "Do you want revenge?"
Young man: "I have been repeatedly insulted by strong men and treated as trash by my master. How could I not want to take revenge?"
The old man touched the young man's head and sighed: "Good boy, let me teach you the skills."
The young man was shocked: "Senior! How can this be done?"
The old man stretched out his hand: "Give me your mobile phone."
The young man looked at the changes on his phone and said in shock: "Senior! Where does this century-old skill come from?"
The old man smiled slightly: "Good boy, this is your backup skill in heaven. You can use it whenever you need it urgently in the future. Don't be insulted again."
The young man frowned: "Isn't this a magic loan? I'm afraid..."
The old man: "Heaven is a big platform. New users can borrow a century-old skill without interest for 30 days. The daily interest rate is as low as half a day's skill, which is more than a week for you."
……
Zhang Yu snorted coldly and turned off the advertisement above.