Revelations from a controversial notebook has exposed what appears to be a chilling blueprint for impeached South Korean President Yoon Suk-yeol’s martial law declaration, outlining extensive plans for mass arrests of opposition leaders, judges and civil society leaders — and potentially even extrajudicial killings.

Attributed to former army intelligence commander Noh Sang-won, believed to be a central figure in Yoon’s martial law plans, the notes have sparked alarm over the extent of the current administration’s authoritarian tendencies.