A man bites a trout during an event promoting the Ice Festival on a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. The annual ice festival, which is one of the most famous and biggest festivals in South Korea, expects to see more than 1,000,000 people attend. The festival lasts for three weeks from January 10 this year. (Photo by Kim Hong-Ji/Reuters)

People take part in ice fishing on a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

A boy fishes for trout through a hole in a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

A boy fishes for trout through a hole in a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

A boy fishes for trout through a hole in a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

A Japanese woman enjoys fishing for trout through a hole with her daughter in a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

People take part in ice fishing on a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

A boy catches a trout with his hands during an event promoting the Ice Festival on a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

A man reacts after catching a trout with his hands during an event promoting the Ice Festival on a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

A man catches a trout with his hands during an event promoting the Ice Festival on a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

People fish for trout through holes in a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)

A man holds trouts after catching them during an event promoting the Ice Festival on a frozen river in Hwacheon, about 20 km (12 miles) south of the demilitarized zone separating the two Koreas, January 10, 2015. (Photo by Kim Hong-Ji/Reuters)