A bonus issue ex-rights reference price equals the prior close divided by (1 + bonus ratio). At 1:8 the quoted price drops to one ninth, but share count rises ninefold, so account value is unchanged.
Korea's average pump price was 1,860.2 won per liter in early September, of which 697 won is tax. Dubai crude jumped $7.6 to $99.9 a barrel, yet pump prices fell for a 16th straight week — the lag explains the gap.
A short-selling net balance becomes reportable when it clears both 0.01% of shares outstanding and 100 million won in value, or 1 billion won on its own. Market caps of 1 trillion and 10 trillion won are where those two tests swap places.