The accident occurred in late March when scaffolding collapsed at a seaport project in Vung Ang economic zone, about 400 kilometers south of Hanoi.
Lee and Kim were managers at Samsung C&T Vietnam, a unit of South Korea’s Samsung Group, which was the contractor on the project by Taiwanese group Formosa.
All of the affected workers were Vietnamese subcontractors.
Police investigations indicated that before the accident occurred, workers felt the scaffolding starting to shake and tried to flee, but the two Korean men allegedly told them to continue working.
The scaffolding collapsed shortly. Afterwards, killing 13 and injuring 29.
If found guilty, the two men could be jailed for up to 12 years.