Hundreds of Korean Air workers wearing protested in the center of Seoul late on Friday, demanding the ouster of the airline’s chairman, Cho Yang-ho, over the behavior of two of his daughters who held senior posts at the company.

One of the sisters, Cho Hyun-ah, became notorious for a “nut rage” incident on one of the airline’s planes that saw her briefly jailed.

The other, Cho Hyun-min, ignited fresh outrage last month, when she was accused of throwing a drink over an advertising executive at a business meeting.

In a country where workers are often expected to show unquestioning loyalty, their cases have become a focus of public impatience with the family-run conglomerates known as chaebol that dominate South Korea’s economy, and over what some people see as unchecked bad behavior by the rich and powerful.