LG Group Chairman Koo Bon-moo, predicting tough challenges ahead this year for the company, urged his executives to keep a close eye on changes at home and abroad, the business group said Friday. Koo's remarks came at a two-day meeting of CEOs from Wednesday with the backdrop of low-pace growth of the world's economy and the weakening yen continuing to weigh down LG's price competitiveness overseas, the company said.