I Sold My Sister’s Kidney to Buy Awakening Stones, and We Both Became Monsters

What the story is about

After awakening in a brutal world where martial talents determine status, Lin Ye discovers he can regenerate from nearly any injury and transfer his pain to chosen targets. Alongside his equally immortal sister Lin Xi, he uses these abilities and an uncanny knack for mastering broken techniques to challenge powerful families and survive a ruthless martial society.