To help companies understand what constitutes bullying, the government published guidelines on the type of behavior that counts as harassment.
Examples included gossiping about colleagues or spreading personal information, as well as forcing someone to drink, smoke or attend a company dinner.
Verbal abuse or embarrassing colleagues in front of others were also listed.
In the past, South Koreans found it difficult to report abuse, with the lack of a legal framework to protect workers viewed as the main reason why many hesitated to speak out.
The legislation is aimed at wiping out so-called workplace "gapjil", which refers to abusive conduct by people in positions of power.
The "nut rage" incident involving Korean Airlines executive was one high-profile example.
Cho Hyun-ah, daughter of the airline's then chairman Cho Yang-ho, made headlines around the world when she flew into a rage after nuts arrived in a packet and not on a plate on board a Seoul-bound flight from New York.