Seoul, April 14 -- South Korea's ousted President Yoon Suk-yeol attended his first criminal trial on Monday on insurrection charges.

Yoon, carried by a black vehicle, arrived at the Seoul Central District Court at around 9:48 a.m. local time (0048 GMT) and entered the courtroom via the court's underground parking lot in a bid to avoid public exposure, local media footage showed.

During the first formal hearing, Yoon reportedly denied his insurrection charges and defended himself by testifying in the courtroom for about 80 minutes. The second hearing was scheduled for April 21.

On April 4, the constitutional court upheld a motion by parliament to impeach Yoon over his short-lived martial law imposition.

With the court's decision, the...