That family is the Lees, who, through their massive Samsung empire, control 17% of their native country's economy.
Samsung Group had proposed a sale of their construction firm, Samsung C&T, to a de facto holding company, Cheil Industries.
Singer, who has a 7% stake in Samsung C&T, believed the sale price was too low.
Shareholders apparently disagreed: on Friday, they voted to approve an $8 billion takeover.
Nearly 70% of shareholders voted in favor of the merger.
The Lee family's $270 billion empire, Samsung Group, encompasses much more than just Samsung Electronics. Under its holding group, Cheil Industries, is a complex network of businesses that range from textiles to entertainment.
The reason the Lees wanted the construction subsidiary to merge with the holding company is to ensure a smooth transition from the current leader, Lee Kun-hee, to the next generation, under the leadership of Lee Jae-yong.
Singer opposed the merger because he thought the offer price undervalued the company.
Singer has already lost two minor battles to the Lees. The first was an attempt to block Friday's shareholder meeting from taking place. The second was an attempt to block the sale of Samsung C&T Treasury notes to a Lee family ally, KCC Corp.
He was denied both in South Korean court.
Remember, the Lee family is extremely powerful in South Korea: Lee Kun-hee himself was once ousted as CEO after admitting to tax evasion and corruption, only to be reinstated a year later with a pardon from South Korea's president.
As The Wall Street Journal's Jonathan Cheng and Min-Jeong Lee note, all may not be lost for Singer, though.
He remains an important shareholder in the newly merged entity, and he did inspire other shareholders to speak out against management.
Friday's meeting included jeers, people shouting "I strongly oppose the merger," and a "parade of minority shareholders" opposing the deal, according to the Journal.
Now, Elliott Management will likely try to kill the merger in court. So the fight may not quite be over yet.