The Korea Customs Service has promised a thorough investigation of the troubled Korean Air owner family, which is suspected of smuggling luxury goods into the country and evading excise taxes.
KCS Commissioner Kim Yung-moon on Monday told reporters that given great public interest in the scandal it will ensure "a thorough and impartial investigation" and make sure they are punished if the allegations are found true.
Kim explained that Cho's wife Lee Myung-hee and their daughters Cho Hyun-ah and Hyun-min will be questioned but added, "It's going to take a while as there are a lot of things that we need to verify beforehand."
Customs officials stand accused of easing the Cho family's habitual smuggling of luxury items on Korean Air flights in return for kickbacks. "We will thoroughly look into that allegation as well," Kim said.
He pledged to come up with ways to improve the current system, saying, "For these items to leave the airport, they have to go through either customs or security officers. There is an element of difficulty in detecting all smuggled goods if someone willingly lies about it."
The two daughters have also both been in trouble with the law over their uncontrollable outbursts.
From left, Lee Myung-hee and her daughters Cho Hyun-ah and Hyun-min