The crime-solving drama "NCIS: Los Angeles" is a spin-off of the "NCIS" series, starring Chris O'Donnell and LL Cool J. The protagonist is the Office of Special Projects (OSP), a special team focusing on high-risk undercover and reconnaissance missions, which will be responsible for high-risk criminals that endanger national security. Specially trained team members with various cutting-edge technologies and various different identities will risk their lives to perform undercover missions to complete their goals. Agent "G" Callen has a chameleon-like identity-changing technique that allows him to integrate into various underground criminal worlds. His partner, Agent Sam Hanna, a former Navy SEAL, has performed missions in Afghanistan and Iraq, has excellent surveillance techniques, and has provided surveillance data for front-line soldiers. Assisting this team are Agent Kensi, who has a cheerful and lively personality 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 faces of agents. This team has appeared at the end of the sixth season of NCIS. The high-end facilities and the exciting cases have attracted the attention of the audience. With the participation of veteran actors such as Linda Hunt, the OSP team has gradually grown. The popular Abby and NCIS master Leon Vance will also help in the spin-off series.