Simon "Ghost" Riley is from the british special forces. He is a lieutenant and is a member of task force 141 which is composed of five men named Price  Soap, Gaz, and Alejandro.

Ghost suffered from depression and PTSD due to losing the love of his life in a mission. He never moved on and wanted to work himself to death to forget the pain of losing his reason to live.

When he found out, that person was actually alive he felt betrayal and hurt so deep that he has gotten more cold.

