Opposition leader Lee Jae-myung was sworn in as South Korea’s next president on Wednesday following a dramatic snap election six months after the country’s previous leader declared martial law and plunged the nation into chaos.

After a tighter-than-expected presidential election, Lee Jae-myung aims to restore stability to a nation wracked by months of political upheaval. But issues of trust remain.

The new president, who will take office immediately, faces a number of pressing challenges including repairing domestic divisions, navigating US trade tensions and confronting North Korea’s growing nuclear threat.