Write a descriptive and concise alternate history scenario in the form of a lengthy history book chapter in which the pro-democracy movement in which the new democratic government of Taiwan chooses to restore the Kingdom of Tungning ruled by the House of Koxinga/ Zheng dynasty as its royal family, after the death of Chiang Kai Shek's son and former dictator of the ROC [Republic of China] in exile on the island archipelago, Chiang Ching-kuo in 1988. Zheng Chouyu becomes the new King of the restored Tungning Kingdom, with pro-democracy activist Lee-Teng-Hui becoming his Prime Minister. The Kingdom of Tungning later is reluctantly annexed by Japan soon after its restoration, due to a referendum held on the status of the nation showing a overwhelming support for Taiwan returning to Japanese rule. Japan restores the Government General of Formosa as the state government of newly reannexed Taiwan, but the Zheng royal government remains the local administration of Taiwan. 
In the Korean peninsula, the pro-democracy movement manages to overthrow the dictatorships of General Chun Doo-hwan and Chun's handpicked successor, Roh Tae-woo in the Republic of Korea [ROC] located on in South Korea, and due to overeager elements of the ROKAF [Republic of Korea Armed Forces], launching an unapproved guerilla campaign and eventual 'liberation war' against the Soviet satellite DPRK [Democratic People's Republic of Korea] occupying the Northern half of Korea, Korea is united for the first time in 43 years. But before the newly reunified Korean state can even get itself off the ground or even form a coherent government policy, the Mansudae Assembly Hall in Pyongyang and Korea National Assembly Proceeding Hall in Seoul are destroyed by mysterious explosions, decapitating the government of the newly unified Korea. 
In the chaos that follows, a group of radical student activists, pro-democracy militants and monarchist elements reluctantly join forces and manage to seize control of the Korean government, proclaiming the dissolution of the DPRK and ROK and proclaiming the restoration of the Taehan Jeguk [Korean Empire], which was the government and administration of Korea from 1897-1910, as the government of Korea. South Korean pro-democracy activist Kim Young-sam is chosen as Prime Minister and de-facto head of state by the new Korean revolutionary government, while the Korean government searches for a descendant of the House of Wang/Goryeo dynasty to become the Emperor of Korea. 