The year 2016 was arguably one of shock and unpredictability for Thailand. No other major event in 2016 was as historically significant as the passing away of His Majesty King Bhumibol Adulyadej (1927–2016) on 13 October 2016 at the age of eighty-nine. He was the beloved King of all Thai people, and the world's longest-serving monarch, reigning for seventy years. His frail health since 2014 had been closely monitored by Thailand's leading medical professionals. The Royal Household Bureau's various announcements on the condition of his health time and again caused concern nationwide and led to many religious ceremonies to wish him a speedy recovery. Once the official announcement of his passing became public knowledge, the whole nation seemed to come to a standstill. Most commuters travelling home that evening shed tears publically without embarrassment while checking the news on social media. Every sector of Thai society agreed that the King's passing was a major historical transition. Once they overcame this sense of great loss, the other prevailing question was what would happen in terms of the royal succession.

Aside from the King's passing, the political landscape in Thailand in 2016 was more pessimistic. Thai society continued to be characterized by polarized contention and other negative political features. The full blossom of democratization was still far from reality, though the draft charter was completed and approved by a nationwide referendum in August 2016. Some argued that Thailand was still in an indefinite transition, while others labelled it a great leap backward. For those with a pessimistic view, the acronym COSTUP would describe the state of affairs in the country in 2016, standing for Corruption, Oppression, Social injustice, Tyranny, Unequal rights or unemployment, and Poverty — representing the rise in political, economic, and social costs confronting the military-led regime, and Thailand in general, in 2016.

The King's Passing: His Enduring Legacy and a Historical Transition

To most Thai people the passing of the revered monarch in October 2016 was so overwhelming that nationwide bereavement and grief ran very high. The “allin-black” practice was adopted nationwide, governed by different timeframes according to the sector of the country; i.e., the general public, regardless of gender or age, donned black outfits as a sign of mourning for at least thirty days, while the government has decreed that its officials will wear black for a full year.