Gwiju or ‘ghost liquor’ is triple distilled sanghwang soju (above) that comes in at a whopping 71.2% alcohol. Its origin started when Master Kim himself tried Bacardi 151 for the first time- his immediate thought was, “I can make that stronger and less harsh”. Its name was later coined by a local TV network staff member after he said: “If a human drinks this, he becomes a ghost; if a ghost drinks this, he will turn back into a human”.
https://offthewagontasting.wordpress.com/2019/04/02/samhae-soju/