This Life, I'm the Master

When her family's guardian stone awakens in her—the illegitimate daughter rather than the legitimate heir—she is finally embraced with warmth, only to die by her fiancé's hand and realize it was all a ruse to steal her power. Given a second chance by a devilishly sweet offer, she vows to seize the stone, claim leadership of the household, and repay every betrayal a hundredfold while trusting no one. Yet the desperate eyes of the man who raced to save her—her sister's supposed ally—haunt her at every turn, daring her to wonder if his heart is the one truth in a world of lies.