South Korea's president ordered on Tuesday swift action to penalise those responsible for a major data leak at e-commerce giant Coupang affecting more than 33 million customers.

It was "astonishing that the company failed to recognise the breach for five months", President Lee Jae Myung said, adding that the "scale of the damage is massive".

Coupang is South Korea's most popular online shopping platform, serving millions of customers with lightning-fast deliveries of products from groceries to gadgets.

Seoul has said the leak took place through overseas servers from June 24 to November 8.

But Coupang only became aware of it last month, according to police and local media, who said the company had issued a complaint in November against the alleged culprit -- a former employee and a Chin

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