On the night of his eighteenth birthday, Lin Tian is forced to inherit five million in “Heartflow” emotional debt left by his great-grandmother. His creditor is none other than Lilith, a voluptuous, languid succubus with curved horns. Get a job and pay it off? No. This cunning otherworlder has his sights set on the “emotional economy.” And so, a transmigrator bound by loan-shark debt teams up with a succubus creditor, a fugitive mech, and a half-blood paladin. Caught between three modernized dynasties, they launch a hilarious startup saga about “love and repayment.” Their goal: use Earthling tricks to overturn the rules of this world!