The Veil

It is about a top field agent in the National Intelligence Service (NIS). After going missing a year ago, he returns to the organization to find an internal traitor who dropped him into the abyss. [About] The Veil is an upcoming South Korean television series starring Namkoong Min, Park Ha-sun and Kim Ji-eun. It won the 2018 MBC Drama Screenplay Contest by writter Park Seok-ho. It is scheduled to premiere in September 2021 as the first series on MBC's newly established Fridays and Saturdays at 22:00 (KST) time slot. [Source: Wikipedia]