TACIT

A brief description of the manhwa TACIT:

A world destroyed by pollutants that spreads zombie viruses and the people who have adapted to live there. Amina, a village served by both high resources and an excellent doctor, Simon.

However, Simon disappears and the people of Amina fall into despair.
Ruby was born and raised in Amina.

Due to her presence, the long forgotten incidents begin to be uncovered.