"It is something I had been thinking long and hard about for quite some time", Kwon said in a Samsung announcement.
The abrupt departure of Kwon, who had been acting head of the tech conglomerate since its de facto leader, Lee Jae-yong, was detained for a bribery trial, throws Samsung into yet another leadership vacuum.
Lee - who took the reins of the company after his father's heart attack in 2014 - was found guilty of bribing a friend of former South Korea President Park Geun-hye to secure a merger that would tighten his grip on Samsung. While Samsung was battered a year ago following the Galaxy Note 7 debacle, it seems to have bounced back and will soon announce a much rosier financial position.
"Fortunately, the company is now producing best-ever results but this is merely a fruit of decisions and investment made in the past", he said in a statement.
"[Samsung] has been showing record performances", Kwon said.
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Meanwhile, Gizmochina also stated that most of the available information on the OnePlus 5T's specifications were about its screen. OnePlus hasn't officially confirmed the new handset yet, but another leak points towards an imminent launch.
However, in a sign of good news for the company, its estimated operating profits for the third quarter of 14.5 trillion won (US$12.8 billion) marked a record for quarterly profit, almost tripling the 5.2 trillion won earned a year earlier.
Kwon added the company is facing a grave situation despite it making record-breaking earnings.
"Kwon himself might have thought over the issue for a long time", a Samsung spokesperson said, "but the notice itself was a surprise internally as well".
Samsung said its July-September profit was likely 14.5 trillion won ($12.81 billion), compared with an average forecast of 14.3 trillion won from a Thomson Reuters survey of 20 analysts.
Kwon joined the company in 1985 as a researcher of the company's Semiconductor Research Institute in the United States.
Amazingly, Kwon's move was announced almost simultaneously with Samsung's third-quarter guidance, which predicted a record operating profit due largely to its business of producing chips and other components for mobile devices-a division that Kwon helped build. Semiconductors accounted for $7.2 billion during the quarter, Reuters reported, marking the company's top-performing business.