Lee Jae-yong, the heir-apparent and de facto chairman of the world's largest smartphone manufacturer, Samsung, has been sentenced to five years in prison.
The corruption conviction of such a senior figure would be newsworthy enough – but in this case there are potential ramifications for other business leaders and an impeached former president.
That's because the trial is related to a long-running bribery scandal that has exposed the division in South Korean society between older conservatives and a younger population yearning for change.
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Here's everything you need to know.
Why was Lee jailed?
He has been found guilty of "bribery, embezzlement, hiding assets overseas, concealing profit from criminal acts and perjury", says The Guardian.
Central to the case are charges that he approved donations totalling 41bn won (£29m) to non-profit organisations run by former South Korean president Park Geun-hye's confidante Choi Soon-sil, in return for political favours.
Samsung has admitted making the payments but says it was "forced to do so by Park". It also confirmed making payments and donating a horse to help further Choi's daughter Chung Yoo-ra's equestrian career.
Prosecutors argued the payments were made in return for government support for an $8bn (£6.3bn) merger of two Samsung divisions that would consolidate the Lee family's stranglehold on the company.
"The merger was opposed by many shareholders, but went through after it was approved by the national pension fund, a major Samsung shareholder," the Guardian reports.
Is the prison sentence significant?
Hugely so. "This isn't the first time a top executive of a big conglomerate has been convicted for corruption in South Korea," says the BBC, "but in the past, they've either been given suspended sentences or have been pardoned by the president."
The Guardian refers to the widely quoted "3-5" rule - "three years sentencing, five years’ probation" - for convicted leaders of so-called "chaebols", the family-run global conglomerates that dominate South Korea's corporate landscape.
All that is changing under new president Moon Jae-in.
Park Sangin, a professor of economics at Seoul National University, said shortly before the verdict: "If Lee receives a heavy sentence, it can be seen as the shattering of the ‘too-big-to-jail’ trend of the past."
What does this mean for president Park?
It's bad news. She was impeached in March after a three-month leadership crisis and faces trial later this year, with the potential for a sentence of life imprisonment.
"Lee’s conviction bodes ill for Park as prosecutors have argued she and Lee participated in the same act of bribery," says Reuters.
Things already weren't looking good following a spate of convictions.
Choi was sentenced to three years in prison in June for using her influence to solicit favours for her daughter. Then six ex-officials in Park's government were jailed in July for "blacklisting" figures deemed unfriendly to the leader, says the New York Times.
There remains a core of support among conservative older generations for Park, the daughter of former dictator Park Chung-hee, who Reuters says is "credited with dragging the country out of poverty in collusion with the… chaebol".
But Park’s "nostalgic supporters are few" compared with the huge number of mostly younger Koreans that turned out in central Seoul every week to call for her to be ousted – and who delivered a landslide for President Moon in May.
What does this mean for Samsung?
Lee has been acting as stand-in chairman at the firm since his father, Lee Kun-hee, suffered a heart attack in 2014. The older Lee was himself convicted of tax evasion in 2009 but received a suspended sentence.
Investors are concerned that the "enforced absence" of the de facto head will "create a leadership vacuum at Samsung... and harm its ability to make key strategic decisions", says The Guardian.
Samsung's shares fell one per cent after the sentencing. Lee's solicitors have vowed to appeal and said they are confident the conviction will be overturned.
The share price drop was not overly dramatic, however, which perhaps reflects the fact that the company has "continued largely unaffected" since Lee was first arrested six months ago. It posted a record profit of 11trn won (£7.6bn) for the last quarter.
