Korean Air Lines¡¯ labor unions called for the youngest daughter of its chairman, a sister of the infamous ¡°nut rage¡± heiress, to step down from management after her alleged abusive behavior against an advertising agency official caused public outrage.

Cho Hyun-min, also known as Emily Cho and a senior vice president at Korean Air, apologized Thursday for what she called her ¡°foolish behavior¡± after media reports said she threw water at the face of an advertising agency manager during a recent business meeting.

Cho, speaking to TV channel MBC after she cut short her vacation overseas and arrived at Incheon International Airport on Sunday, denied she had thrown a cup of water at the manager¡¯s face but said she had ¡°pushed¡± it.