The Behavioral Analysis Unit (BAU), a team of seven elite senior agents under the FBI, continues to travel across the country, providing outstanding criminal psychological profiling and behavioral analysis for real cases. The rigorous and capable supervisor, Aaron Hotchner, chose to stay in the BAU to continue investigating serial killers, which led to his wife divorcing him and taking their six-year-old son. Senior agent David Rossi, with unresolved issues after more than ten years of retirement, voluntarily returned to join the BAU, gradually adapting to the new model of the BAU and integrating into the team. Derek Morgan, confident and humorous, is an expert in crime reconstruction, showing no mercy when combating criminals, but serving as a lively atmosphere adjuster within the group. "Genius" is the most concise description of Dr. Spencer Reid; he has an extraordinary memory and is like a living casebook. Shy yet strong, he has endured numerous tests.