One Hundred Days of Solitude

(Ruthless) + (Decisive) + (Clever protagonist) + (Survivors band together) + (Protagonist leads everyone to survive)

Liu Zhu grew up alone and penniless. His parents wouldn't raise him, so he was taken in by an orphanage, where he finally experienced the warmth of a family. But when a virus broke out across the world, Liu Zhu's life once again plunged into the depths of despair.