Mysterious ”hand mirror” that appeared at Lee Jae Myung's campaign venue... What is its true identity? (South Korea)

In response to the growing threat of terrorism targeting Democratic Party of Korea presidential candidate Lee Jae-myung, supporters of the candidate have been armed at campaign venues as security for the candidate is being strengthened during the election campaign.
Recently, at Lee's campaign rally, supporters were seen bringing blue balloons and hand mirrors to protect the candidate. As assassination threats against the candidate have increased,
It is said that supporters bring balloons to disorient snipers. At the campaign site, supporters were seen holding hand mirrors and pointing them in the direction of surrounding buildings.
The purpose of the attack was to hinder the aim of any assassins who may be in nearby buildings. An official from the Election Strategy Committee explained, "This was something that supporters prepared voluntarily."
On the 3rd of this month, the Democratic Party said, "We have received a series of reports that people are plotting to attack candidate Lee." As a result, candidate Lee has reduced his interpersonal contact at the scene and will be staying with Kwang Jong-un on the 12th.
At the presidential election campaign ceremony held at Gwanghwamun, Lee wore a bulletproof vest under his campaign jacket. Candidate Lee was attacked and beheaded in Busan in January last year.
Moreover, as the presidential election is being held following the declaration of martial law and impeachment of former President Yoon Seok-yeol, concerns about candidate Lee's personal status are growing among the party and his supporters.
On the 10th of this month, the Democratic Party launched a task force (TF, special team) to deal with terrorism, headed by Kim Min-Seok, standing co-chairman of the election campaign committee for Lee.
Rep. Park Seong-won of the Democratic Party of Korea said, "Candidate Lee has changed from stab-proof clothing to bulletproof clothing, and has also prepared clothing that is both bulletproof and stab-proof."
The Democratic Party has requested the government to strengthen security for candidate Lee, while also
The government is analyzing information provided from various angles and taking measures to strengthen security. It is restricting the gathering of people in close proximity to the platform of candidate Lee's campaign, and candidate Lee is refraining from direct contact such as shaking hands or hugging.
At the National Defense and Security Review Meeting of the Election Campaign Committee held at the party headquarters in Yeouido, Choi Yun-ho (former Vice Director of the Presidential Security Service) said, "In accordance with the Presidential Security Law, the high-performance security equipment possessed by the Presidential Security Service will be used for the defense and security of the National Defense and Security Review Meeting."
"We need to deploy security equipment and provide more intensive security."