Influencer Preeti Nair, known as Preetipls, and her brother Subhas Nair were investigated by Singapore police in August 2019 after their rap video 'K Muthusamy' responding to a NETS E-Pay 'brownface' advertisement drew accusations of promoting racial disharmony. The siblings later apologised, but the episode ignited a national debate on race and free expression.

The controversy began with an advertisement for NETS E-Pay, a unified e-payment system, which featured Mediacorp actor and DJ Dennis Chew portraying characters of different races, including an Indian man with artificially darkened skin and a Malay woman in a headscarf. The ad drew swift backlash online for brownface, with critics asking why the production had not simply hired performers of the respective races.

In response, the Nair siblings released a video titled K Muthusamy, named after the Indian character Chew had played. Set to a reworked pop backing track, the video mocked the ad's stereotyping, with Subhas dressed in a get-up echoing Chew's brownface portrayal. But the lyrics, laced with profanity directed at Chinese Singaporeans, proved incendiary in their own right.

Police confirmed they were investigating the video for offensive content after a report was lodged, stating they would not tolerate content causing ill-will between races. Law and Home Affairs Minister K. Shanmugam weighed in, saying the video crossed the line of criminality and that allowing it to remain online would be tantamount to permitting other racially offensive material. The US State Department's 2019 human rights report on Singapore later noted that police had issued warnings to the siblings for promoting racial disharmony.

On August 2, 2019, the siblings apologised in an Instagram post, saying they were sorry for any hurt unintentionally caused and that the video had been intended to raise consciousness about representation. The original ad's creators, Mediacorp's The Celebrity Agency and agency Havas, had already apologised and pulled the campaign.

The episode split public opinion. Supporters argued the siblings' anger was justified and that the state's response revealed a double standard, since the brownface ad itself had not been investigated. Critics, including religious leaders and ministers, maintained that retaliatory racial attacks could not be condoned. Commentators noted the irony that a video protesting racism had itself been deemed racially offensive.

For Preeti, one of Singapore's most prominent content creators, the saga was a defining moment. She later spoke about the emotional toll of the prolonged scrutiny, describing weeks of watching the news and waiting for an outcome. The incident remains frequently cited in discussions about the boundaries of satire, race discourse and online speech in Singapore.