The protagonist is the Office of meijubar.net Special Projects (OSP), a special team that focuses on high-risk undercover and reconnaissance missions. They will specialize in high-risk criminals that endanger the security of the country. The specially trained team members with various cutting-edge technologies and different identities will risk their lives to perform undercover missions to achieve their goals. Agent "G" Callen has the identity-changing skills of a chameleon, allowing him to blend into the world of various underground criminals. His partner, Agent Sam Hanna, is a former member of the Navy SEALs who has performed missions in Afghanistan and Iraq. He has excellent surveillance skills and has provided surveillance data to front-line soldiers. Assisting this team are Agent Kensi, who is cheerful and lively and comes from a family of warriors, and psychologist Nate Getz, who is good at getting into anyone's head, analyzing targets and evaluating the appearance of agents. This team has appeared at the end of the sixth season of NCIS. The high-end facilities and stage-frightening cases have attracted the attention of the audience. With the participation of veteran actors such as Linda Hunt, the OSP team has gradually grown. Abby and NCIS master Leon Vance will also help in the spin-off series.