South Korea mourns former PM Lee Hae-chan

South Korea is sad because their former Prime Minister, Lee Hae-chan, passed away.

He was a very important person in the country's history, especially for helping to make South Korea more democratic.

He was 73 years old and died from a heart attack while he was in Vietnam for a meeting.

Many people, including the current president and leaders from Vietnam, are saying nice things about him and how he helped the country.

He was also part of a group that gives advice about dealing with North Korea.

Even though he sometimes argued with other politicians, he was known for being a smart leader who helped many presidents win their jobs.