Survival from Extinction

In the future, when an asteroid named TSWY was about to hit the earth, it was destroyed by a joint use of weapons by leaders of various countries. Unexpectedly, the elements in the asteroid reacted with the atmosphere, and a black rain fell from the sky. Most of the people who were exposed to the black rain were infected, and only a handful of people survived. In an instant, all life was reduced to ashes and smoke was everywhere. Where should the protagonist Chen Fan go...