My Terminally Ill Sister's Lifespan Has Been Extended to a Thousand Years by Me.

"I'm sorry, parents..." Lin Xuan's ears still echoed with his parents' instructions before they died, take good care of your sister. Lin Xuan burst into tears beside his sister's hospital bed. "The system is activated, host Lin Xuan, please note: By selecting the target girl through the strategy, increasing the other's favorability can extend the sister's lifespan. Currently, Lin Yue's remaining lifespan is: three days." What kind of system is this? This is a life-saving straw. Who do you want me to conquer? Su Qian! NTU campus beauty! Lin Xuan: Can I make a substitution?