It's been revealed that he has been donating 200,000 KRW (approximately $174 USD) per month to Zambia's education centers since May 2012. As it's been over 5 years, he's donated over 14 million KRW (approximately $12,000 USD).
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However, his donations have just recently come to the spotlight. 'Food for the Hungry', the organization he donates through, said, "Doojoon got to know us through his older sister and has been supporting us silently."