After being swindled by someone from his hometown and saddled with a huge debt, Jiang Ying is about to lose the homestead that belongs to his family. Then, by chance, a Celestial Abode app appears on his phone, making him the mortal-world guide for the immortals of Heaven.
Sun Wukong, Tang Sanzang, Taishang Laojun, Chang'e, and a host of immortals known only from myths descend into his cramped rented apartment.
As long as he takes good care of these immortals from Heaven, wealth, cultivation techniques, and magical treasures are all within reach.
Conquering the city is only the beginning. Ascending to the Immortal Realm is the ultimate dream!
Although I skipped through it, your point is getting further and further away from the main theme, even veering off course to some extent after obtaining the cultivation technique. The immortal was just mentioning it casually.