Write a realistic, plausible alternate history scenario in the form of a history book chapter completely set in the world of the alternate history secenario with absolutely no references to real life, OTL or that this is even an alternate history timeline at all, in which the half Korean eldest son of the now long deceased former top dog in the Qing military turned rising star in the Beiyang Government after the 1911-1912 Xinhai Revolution and later first Great President of the first Republic of China the Beiyang Government ruled from 1912 to 1928, whose term lasted from 1912-1915, Yuan Shikai, [Shikai's half Korean eldest son] Yuan Keding, [Keding] accepts the offer of Imperial Japanese Army officer Kenji Doihara to collaborate with the Japanese during the 1928-1947 Second Sino Japanese War between Imperial Japan, the Beiyang Government-ruled first Republic of China as the Japanese protectorate of the Reorganized National Government of the Republic of China flying a modified version of the Nationalist Chinese flag, using Nationalist Chinese symbols and being ruled by a Pan Asianist, anti-Communist, pro-Japanese splinter faction of the Kuomingtang lead by Sun Yat-Sen's protoje and true heir, Wang Jingwei who also acted as the Reorganized National Government's first President from 1928-1930 onwards until the end of the war, the Japanese protectorate of the Qing Imperial family, the Manchu House of Aisin-Gioro-ruled Empire of Manchukuo in Manchuria from 1932, the Imperial Japanese protectorate of the Genghis Khan-descended Mongolian Imperial House of Borjigin Mongolian Autonomous Federation/Mengjiang in Inner Mongolia's Chahar and Suiyan provinces from 1939, the Yunnan Clique in Yunnan against Nationalist China ruled by the main branch of the Kuomingtang with Yat-Sen's more famous disciple turned corrupt politician and evil warlord who was a puppet of Soviet dictator, Josef Stalin, the Cantonese minor nobleman Chiang Kai Shek as its combined head of state and leader of the Nationalist Chinese armed forces in Guangdong and Guangxi, Nationalist Chinese puppet state of the Hui Muslim Ma noble clan-ruled warlord state of Xibei San Ma in the Hui Muslim-dominated Northwestern Han Chinese provinces of Qinghai, Gansu, and Ningxia, the USSR then lead by Josef Stalin and the USA, [Keding accepting Doihara's offer to collaborate with the Japanese during the Second Sino-Japanese War in this timeline] instead of [Keding] refusing [to collaborate with the Imperial Japanese] like in real life, due to Yat-Sen being killed sometime after the 1911-1912 Xinhai Revolution instead of in 1925 like in real life in this timeline, Kai-Shek himself being killed before he [Kai-Shek] can launch the 1926-1928 Northern Expedition against the Fengtian Clique ruling over Manchuria from the last days of the Xinhai Revolution until 1928 and the Beiyang Government-ruled first Republic of China by a disgruntled Cantonese citizen in this timeline and thus Nationalist China remains confined to Guangdong and Guangxi in this timeline, the death of the first leader of the Fengtian Clique who was also the warlord of Manchuria in addition to being head of the Fengtian Clique's armed forces and military dictator of the Fengtian Clique, Zhang Zhuolin being killed sometime after the Xinhai Revolution ends in 1912 in this timeline instead of in 1926 like in real life, along with his eldest son and heir to his combined positions as warlord of Manchuria, leader of the Fengtian Clique's armed forces and military dictator of Manchuria, Zhang Xueliang, and the last clan head of the main branch of the Imperial House of Aisin-Gioro ruling over Outer Mongolia, Inner Mongolia, Tuva, East Turkestan, Tibet, Yunnan, Han China, Shaanxi, Guangdong, Guangxi, Hui dominated Central China, and Han China from Manchuria as Emperor of the Qing Empire, Aisin-Gioro Pu-Yi, who [Pu-Yi] had the regal and era name of Xuantong, [Emperor Xuantong of the Great Qing Empire] taking Zhuolin's combined positions as warlord of Manchuria, leader of the Fengtian Clique's armed forces and military dictator of Manchuria with the Qing Imperial court seizing control of the Fengtian Clique itself after Zhuolin's earlier death in this timeline and keeping Manchuria seperate from China with the remnant of the Qing’s modernized army corps envisioned as a regular and professional fully trained and equipped according to Western standards with a reserve, the New Army stationed in Manchuria after the Xinhai Revolution, which became the Fengtian Clique's de-facto combined armed forces, the National Pacificiation Army after the Xinhai Revolution and heavy Japanese help, which along with the Northern Expedition never happening in this timeline makes the formation of Manchukuo in 1932 in this timeline a natural evolution of the now Xuantong-lead and Qing Imperial court-ruled Fengtian Clique into a unitary parliamentary constitutional Imperial personalist royal monarchy [Manchukuo]. 

The Beiyang Government as the short-lived Empire of China formed and ruled by Shikai as its first and only Emperor from 1915-1916 defeating what would become  Nationalist China in the Chinese Civil War of the National Protection War from 1915-1916 in this timeline  
 and remaining the Empire of China after Shikai's death instead of losing the National Protection War and reverting to the first Republic of China on Yuan’s orders just before his death like in real life also helps prevent the modern warlord era of post-Xinhai, post-Qing Chinese history from 1916-1928 that occurred after the National Protection War like in real life as Han China itself is stable under the surviving Empire of China, which is forced to let not only Manchuria, but Outer Mongolia, Inner Mongolia, Tuva, East Turkestan, Tibet, Yunnan, Han China, Shaanxi, Guangdong, Guangxi, Hui dominated Central China go and confine its [the Empire of China's] borders to Han China proper.

Thus the Reorganized National Government in this timeline is not formed as a reshuffling of the first Republic of China but as a restructuring of the surviving Empire of China and is thus known as the Reorganized National Government of the Empire of China in this timeline with Jingwei as its first Prime Minister. 

Keding becomes Emperor of the Reorganized National Government of the Empire of China under the regal and era name Yuntai. 

The Anhui Clique still effectively does the real governance of China under the Beiyang Government as the Empire of China with the Anhui Clique's political wing, the Anfu Club managing Chinese political life and the Anhui Clique's financial wing, the New Communications Clique, effectively managing Chinese finances. 

Thus the Second Sino-Japanese War is the mopping up of the CCP-ruled Chinese Soviet Republic in Inner Shaanxi and the defeat of some of Kai-Shek's cultists in Guangdong and Guangxi by the Empire of China and the Nationalist Chinese government with Japanese help.

This allows Imperial Japan to survive post-1947 into the rest of the 20th century into the 21th century and beyond and simultaneously hold on to Taiwan, the entire Korean peninsula, Russia's Sahalkin and Kuril Islands, Palau, the Marinas and the Carolinas post-1947 into the rest of the 20th century into the 21th century and beyond, although it still experiences the post-WW2 industrial, economic, military, cultural and technological growth that happened in real life. 

Manchukuo also survives post-1947 into the rest of the 20th century into the 21th century and beyond as well, becoming the strongest military power and industrial power in East Asia, albiet under Japanese protection. 

The Beiyang Government also survives post-1947 into the rest of the 20th century into the 21th century and beyond. 

Mengjiang also survives post-1947 into the rest of the 20th century into the 21th century and beyond.