Shun Shin Kun, Lord Chunshen, served as Prime Minister and Head of Military Affairs for Chu and stood among the influential Four Lords of the Warring States. He possessed long, straight dark reddish-brown hair, thick eyebrows, a solid, somewhat muscled physique, and pale white skin. He typically wore ornate silk robes reflecting his high rank, paired with military boots. His personality was caustic, irritable, and scathing; he readily offered abrupt insults, displaying a temperamental and confrontational nature. Over roughly two decades, he played a central role in transforming Chu into a superstate through political and military leadership. His long-standing presence in interstate affairs included attending the funeral of Qin King Sho. Shun Shin Kun first appeared during the Battle of Bayou arc, expressing unfamiliarity with figures like Hou Ken and Ri Boku and initiating investigations. He later emerged as a key architect of the coalition against Qin, recognizing its expansionist threat alongside Ri Boku. At the Zhao-Chu border, he met Ri Boku to strategize. During the coalition assembly, his reputation secured the allegiance of generals from multiple states, leading to his appointment as supreme commander of the allied forces. He directed the coalition campaign remotely, observing the battle at Kankoku Pass. The death of Chu's Great General Kan Mei during this campaign provoked his intense anger. Following the coalition's failure, he rejected Ri Boku's proposal to reclaim Sanyou, instead ordering an attack on Qi. This move proved ineffective due to a counterattack by Qin's Mou Bu. Held responsible by the king of Chu for the military defeat, he was stripped of his titles as Prime Minister and Head of Military Affairs and exiled to Raiko City. In the Koku You Campaign arc, multiple assassins struck him down while he walked to his carriage in the rain. These assassins were affiliated with Ri En, and the killing stemmed from political tensions surrounding Chu's succession crisis. He was buried in Chin City, his birthplace. Shun Shin Kun possessed no notable martial prowess, evident in his assassination. His leadership and strategic acumen were formidable; he commanded the entire Chu military and adapted effectively to complex scenarios. His influence alone persuaded generals from four states to accept his coalition leadership. He demonstrated masterful strategic foresight, anticipating Qin's ambitions to conquer China—an insight shared only by Ri Boku at the time. Politically, his influence rivaled that of a king, and his policies were instrumental in elevating Chu's status over two decades. He had an unnamed son and a romantic relationship with Ri En's younger sister, making Ri En his brother-in-law. This relationship later turned adversarial, culminating in his assassination orchestrated by Ri En's affiliates. His legacy endured through his impact on Chu's rise and his role as one of the Four Lords of the Warring States.