Rangers manager Pedro Caixinha, who brought in eight new players in a bid to close the gap on last season's runaway champions Celtic, described the defeat as "unthinkable" and said it was the worst result of his managerial career.
"I think it is a thing that happens once in a lifetime ... and that is part of the football, but as I say, it's disappointment and I assume all the responsibility," he told the club's website.
Rangers won promotion back to the top flight in 2016 after a four-year exile from the elite, which began after their financial meltdown and liquidation in 2012 when they were demoted to the basement of the Scottish game.
(Writing by Peter Rutherford in Seoul; Editing by Greg Stutchbury)
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