I'm the Villain's Constellation with Empty Pockets

Ga-Hyeon never expected to find himself inside a novel, let alone as the Constellation of the villain, Tae-Beom Baek. Determined to prevent the world’s destruction, he decides to sponsor Tae-Beom and lead him down a righteous path instead, but there’s one problem—he’s broke. As Ga-Hyeon struggles to alter Tae-Beom’s fate, their bond deepens, and Ga-Hyeon faces a hard truth: his efforts to save the world may push Tae-Beom toward the very destruction he’s trying to stop.

(Source: Tapas)