When Gu Yan's account balance falls below zero, he unexpectedly receives an exclusive allowance of one billion, subject to strict rules. If his secret is exposed, he will face severe consequences. When his companions mock him for being unable to pay for a meal, he secretly buys the entire restaurant, making the snobbish people pay for their own arrogance. When a kind street vendor who gives him a pancake is bullied, he steps in to help and buys the vendor's stall. Faced with absolute power, hypocrites reveal their true colors, while even the smallest acts of kindness shown to him during his darkest days are richly rewarded. As hostile executives tighten their grip, Gu Yan holds on to his trump card, ready to put an honorable end to every scheme.