Gathering Spare Cash from All Corners

Yuan Qianxin, widely acknowledged by his classmates as the ultimate grind king, accidentally binds himself to a System.

Together, he and the System transmigrate across different worlds and eras, saving up spare cash to complete the "Save Your Spare Cash" event missions.

Otherworldly Immortal Realm: Transmigrated as a college graduate who has just started working at a bank

By chance, Yuan Qianxin and the System discover an ancient immortal fruit that can greatly increase magical power.

Yuan Qianxin: "Our branch can't afford to fall behind on performance. Let's work this ancient immortal fruit into our everyday marketing, including deposits and wealth management, and promote it through livestreams."

And so, the branch, once situated on a remote island, suddenly becomes the most popular branch in the entire Immortal Realm. Even the Demon Realm's richest tycoon comes to the branch to open a foreign currency deposit account.

Fantasy Ocean: Transmigrated as the antisocial, easygoing clan leader of the East Sea merfolk

Elder: "Clan leader, you're really going to build a botanical garden in the heavily polluted Guixu Sea?"

Yuan Qianxin: "I've found water-cleansing spirit herbs that can purify the Guixu Sea. Now is the perfect time to invest in tapping the sea's economic potential. If we don't invest now, when will we?"

Elder: "Then should I still turn down this year's spell-fighting tournament for the merfolk clan leaders of the Four Seas on your behalf?"

Yuan Qianxin: "Why turn it down? Sign me up, and let's aim for the Heavenly Sea League and its top prize."

Alternate Ancient Era: Transmigrated as a Vice Minister of Personnel with an exceptional talent for financial calculations

System: "The economy here is struggling. What are we going to do about our mission...?"

Yuan Qianxin: "We'll make use of the agricultural advantages they already have, of course, and develop the economy as a whole. We'll team up with the Ministry of Revenue and the Directorate of Agriculture to livestream our farming and teach everyone scientific farming methods and the latest business policies. The key is to combine agriculture and commerce. Also, we'll take everyone's suggestions and get private citizens involved in foreign trade."

Future Interstellar Era: Transmigrated as a young expert from Grind King City, sent to support the development of the laid-back city of Xianyu

At first, the citizens of Xianyu City say: "Yuan Qianxin is 'just as you'd expect' from an 'expert' from Grind King City. When will Xianyu City ever get its GDP up?"

Later, they say: "Wow, without even realizing it, Xianyu City has become a famous model city across the stars. Yuan Qianxin really is an expert from Grind King City!"

Content warning: Fantasy light novel, alternate setting, don't get hung up on historical accuracy.

Theme: Perseverance makes anything possible; hard work and ambition help you save up spare cash.