Both Park Geun-hye and Shin Dong-bin, chairman of the retail giant, have denied the accusations that they were involved in exchanges of presidential favours for large sums of money.
Park Geun-hye could face more than 10 years in jail if convicted of receiving bribes from bosses of big conglomerates in return for favours.
Local media accused the country's president of being a puppet of a Shamanic cult, and that has angered many people.
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