When asked if he had taken orders from the former top court chief, he said he would sincerely explain the situation to the investigators.

Yang served as the top court chief from 2011 until 2017. The prosecutors suspect that Lim, who served as head of planning and coordination under Yang’s direction from 2012 until last year, was a de facto leader and was therefore responsible for many of the irregularities alleged to have taken place during those years.

According to the investigators, in October 2013 Lim visited Joo Cheol-gi, then the presidential secretary for foreign affairs under former President Park Geun-hye. Lim is accused of discussing the outcome of a court case in which some elderly Koreans had filed suit against two Japanese companies over forced labor during the Japanese colonial period. Lim also requested that more judges be dispatched overseas, investigators say.

The Korean plaintiffs, victims of forced labor perpetrated by the two companies during Japanese rule, were awaiting the top court’s verdict on whether to award damages in the case. Yang’s office allegedly delayed the ruling as then-President Park sought to improve ties with Japan.

The prosecutors suspect Lim of creating a 273-page report in November 2016 analyzing whether the ousted former president had violated laws against abusing power. Park was still in office and facing impeachment at that time.

Lim is accused of playing a critical role in interfering in the trial, which led to the ruling that the Korean Teachers and Education Workers Union was an illegal union, and of leading secret investigations of judges who were deemed critical of Yang’s office.

The prosecution raided Lim’s home and office in July and seized a USB flash drive upon which many related documents were stored.

By Jo He-rim (herim@heraldcorp.com)