Yunus, a member of rights group KontraS, suffered severe injuries and lost sight in one eye after two men on a motorcycle threw acid at him in March shortly after he recorded a podcast discussing the military’s role in government.

The four defendants, all members of Indonesia’s Strategic Intelligence Agency (BAIS), are charged with premeditated assault. Prosecutors told a military court in Jakarta that the attack was an act of personal revenge rather than an operation ordered by military superiors.

According to prosecutors, the accused were angered by Yunus and another activist’s protest against revisions to Indonesia’s military law, which expanded the number of government institutions that can employ active-duty military personnel.

The case drew national attention after BAIS chief Yudi Abrimantyo stepped down following the arrests. Rights groups have called for the proceedings to be moved to a civilian court, citing concerns about transparency and accountability.

The court is expected to continue hearing arguments before delivering a verdict.

The case, being heard at the Seoul Central District Court, is part of a series of legal proceedings against Yoon following his removal from office last year after a brief imposition of martial law that triggered political turmoil in the country.

Prosecutors allege the drone operation heightened military tensions with North Korea and risked exposing sensitive information about South Korea’s military capabilities after one of the drones crashed.

The charges include benefiting the enemy, a provision that can apply even without direct coordination if national security interests are harmed.

Yoon has denied the allegations, with his legal team stating he did not take any action that could provoke a military confrontation with North Korea.

The trial is one of eight cases currently involving Yoon, reflecting the legal fallout from his presidency and the controversial martial law declaration. The court is expected to issue a ruling at a later date.