SEOUL, South Korea — The police on Friday began looking into accusations that a sister of Korean Air’s infamous “nut rage” heiress physically abused an advertising executive, insulting him and hurling water in his face during a business meeting.

Cho Hyun-min, 35, is a younger sister of Cho Hyun-ah, a Korean Air vice president whose 2014 tantrum over how macadamia nuts had been served to her in first class made the company a target of ridicule and outrage, in South Korea and elsewhere. Both women are daughters of Cho Yang-ho, the airline’s chairman.

In the “nut rage” incident, Cho Hyun-ah used abusive language, threw documents and even made flight attendants kneel and beg for forgiveness for serving the nuts without first asking her — and in an unopened package, rather than on a plate. Still not satisfied, Ms. Cho ordered the Korean Air plane back to its gate while it was taxiing at New York’s Kennedy International Airport so she could have the chief flight attendant removed.

She was sentenced to one year in prison by a South Korean court for violating airline safety laws. An appeals court later released her after reducing her sentence to a suspended term.