Four years after being sexually harassed by her boss - the mayor of Seoul city - and ignored when she sought help within the office, a woman mustered all her courage to report him to the police.

"I wanted to receive a humane apology and (for him to) be judged by the law," she said in a statement.

But it was not to be.

Mr Park Won-soon was found dead in an apparent suicide in the woods of Mount Bugak on July 10, two days after his former secretary lodged a complaint against him.

This made him the fourth in a string of politicians from the ruling Democratic Party (DP) to be hit by sex scandals - one is currently in jail for repeatedly raping his secretary - and his case was all the more shocking as he had earned a reputation for fighting for women's rights from as early as the 1980s, when he was a lawyer.

His death has also prompted soul searching about deep-rooted malpractices in South Korea's male-dominated work environment, as more women are now emboldened to speak up against the backdrop of a global #MeToo movement against sexual harassment.

Legally, the case has been closed as South Korean law does not allow indictment against a dead suspect. But the victim, whose identity is withheld, refuses to be silenced.

She has held two press conferences, speaking through her lawyer, and she helped the police to unlock Mr Park's phone on July 22.

She is backed by women's rights groups, who called her situation "a case of organised crime sustained by power".

On Thursday, the National Human Rights Commission announced that its representatives have been in talks with the victim and will launch a probe into the case and a review of government measures against sexual harassment involving high-ranking officials.

Law professor Lee Jae-min of Seoul National University said there is still a need to find out the truth, despite the mayor's death.

"Given the gravity of the situation and the people involved, including Mayor Park, the necessary investigations by the relevant government agencies will continue to be carried out, even though it takes time. We need to clarify what happened," he told The Sunday Times.

South Korea's patriarchal society and hierarchical work culture makes it hard for a female subordinate to say no to a male superior's demands, even if it is sexual in nature, for fear of losing her job.

In Mr Park's case, the victim said she approached some 20 people in the office for help, but did not get any support. Some waved it off and expressed disbelief, while others blamed her for being "pretty".

"Let his death lead to a deeper reflection and frank discussion on the toxic grip of sexual harassment in the workplace, and in our culture at large," human sciences professor Cho Kyung-jin of Cyber University of Korea said in a commentary for The Korea Times newspaper.

"This is not about labelling Mayor Park as a pervert, nor is it about denying his legacy. It is about recognising a system that enables powerful men to take advantage of their position to do what they please with female staff in the lower echelons of the rank and file."

Meanwhile, political watchers warn that the sexual abuse surfacing in the DP does not bode well for the ruling party and President Moon Jae-in. Both rose to power promising gender equality and better treatment of women.

"The fact that officials from Moon's party are involved in sexual abuse against women makes a mockery of the President's efforts," said Ms Jessica Lee, a senior research fellow on East Asia at Quincy Institute.