The story of the series Achems is about a person named Mosayeb who, after 45 years of his life, realizes that he is not the only child in the family and has a missing brother or sister., Mosayb travels to Tehran to find his long-lost mother, and along the way, he encounters challenges and complex events that force him to make a difficult choice between his two main concerns: finding the missing person and restoring his lost dignity and respect.