Yoon was arrested in a dawn raid last week, becoming the first sitting South Korean head of state to be detained in a criminal inquiry on insurrection charges over his botched declaration of martial law.
A court approved his formal arrest warrant on Sunday, citing concerns he would destroy evidence, and Yoon went from being a temporary detainee to a criminal suspect facing an indictment and trial.
Yoon was given a 12-square-metre (129-square-foot) cell at Seoul Detention Center in Uiwang on Sunday, according to Shin Yong-hae, commissioner general of the Korea Correctional Service.
He was “assigned to one of the standard rooms used by regular inmates”, Shin told lawmakers during a parliamentary session.
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