The Underworld's Billionaire

Liam Lin's mother is ill; fiancée Claire Shaw breaks engagement. He binds to a System: '100x cashback on Spirits.' He helps Spirits for cashback to save his mother, gains Underworld connections. Claire Shaw hires Master Wulian to steal Liam's lifespan and fortune via a Life-Swap Ritual for her dying grandfather. Liam has Underworld backing; Lord Lingjun intervenes, returns fortune, punishes Master Wulian. Liam saves his mother, becomes wealthy, thrives.