True
The KOSPI held the 5,500 line at the close, though the session saw the index fall as low as 5,305.98 before a late rebound lifted it back above the threshold by end of trading.
The index's closing level — the benchmark figure behind the "held 5,500" characterization — matches across five independent sources to the decimal point, based on end-of-day data published via KRX.
The intraday picture was more volatile: the market dipped to 5,305.98 during the session before recovering in the final stretch. The 5,500 figure therefore reflects the closing price, not a level maintained throughout the trading day.
Readers should note the distinction: the claim that the KOSPI "defended 5,500" is accurate on a closing-price basis, but the index spent part of the session below that mark. The primary sources reviewed cover the closing figures; the intraday low of 5,305.98 marks the session's weakest point.
The claim is True.