What is the fine-grained topic of the following text: On his team are Cha Gun Woo (Kim Bum), a former Navy SEAL and SWAT member who has his own personal motives for being on the team; Jang Min Joo (Yoon So Yi), who is a master of disguise, psychoanalysis and martial arts; and Choi Tae Pyung (Lee Won Jong), who uses his back-alley connections to procure intel. Only return the topic.
Character descriptions of a special investigative team