Questions are being raised about the transparency of the policymaking process surrounding the introduction of single-stock leveraged exchange-traded funds (ETFs). People Power Party floor leader Chang Dong-hyuk stated at a press briefing on pending issues at the National Assembly on the 5th that a special prosecutor investigation should thoroughly uncover whether there were illicit motives behind the presidential office's pushing ahead with the policy despite opposition from experts and relevant agencies.

Chang emphasized the need to closely examine whether abnormal factors such as lobbying, improper solicitations, or the granting of special favors to specific companies were involved, beyond a simple policy failure. In particular, he pointed out that Presidential Chief of Policy Kim Yong-beom pushed for the introduction despite concerns from the Financial Services Commission and the Financial Supervisory Service, raising the possibility of improper solicitations or collusion. He raised his voice, calling for a special prosecutor investigation to reveal whether there are suspicions of funneling benefits to specific companies through stock price manipulation or granting special favors. He also questioned the fairness of the policymaking process by noting that the children of Kim and Financial Supervisory Service Governor Lee Chan-jin are employed at Mirae Asset affiliates.

Chang stressed, "A parliamentary investigation must certainly be conducted, but it should not stop there—it must go as far as a special prosecutor investigation." He added that if the ruling party cooperates, there would be no particular obstacle to introducing a special prosecutor. He also raised suspicions that given President Lee Jae-myung's usual habit of meticulously scrutinizing even individual words in news articles, it is inconceivable that he was not briefed on this policymaking process.

Meanwhile, People Power Party floor leader Jeong Jeom-sik took a stance emphasizing the need for a parliamentary investigation over a special prosecutor. Jeong posted on his social media that day a message calling for a parliamentary investigation in connection with the recent stock market turmoil. He argued that questioning by standing committees alone would be insufficient for a comprehensive investigation of the policymaking process, and that key figures responsible—including Chief of Policy Kim Yong-beom, Deputy Prime Minister for Economic Affairs Koo Yoon-chul, and Financial Services Commission Chairman Lee Eok-won—should be summoned together. He also stated that the management of the National Pension Service should be included as a subject of the parliamentary investigation.

On this day, Chang also took a critical stance on the police's search and seizure of Starbucks headquarters. He described the police's search and seizure, conducted in connection with the controversial "Tank Day" marketing during the local election period, as a "botched investigation" involving political motives. He took issue with the fact that the search and seizure were carried out despite the police's warrant application having been dismissed once, claiming there are suspicions of a political intention to cover up unfavorable issues.

Separately, Chang addressed the controversy over the "kicking remarks" made by People Power Party lawmakers Seo Beom-soo and Jin Jong-o. He stated that this incident cannot be dismissed as a simple case of inappropriate remarks and that appropriate action at the party level is necessary. Chang expressed his apologies to the victims and the public, noting that the matter has escalated from an individual issue to one affecting the entire party. He also indicated that the party must respond responsibly regardless of whether disciplinary action is taken.