Often, manhwa on the Chinese kingdom showcase rich cultural details, epic battles, and the exploration of different social classes. The storylines might incorporate elements of romance and adventure too.
The best bet could be to search on well-known manga and manhwa aggregator sites. They often have a wide range of options and might have the English version of 'My Kingdom' manhwa. Just make sure to stick to legal sources to support the creators.
There was a long-term grudge and war between the Yiqu Kingdom and the Qin Kingdom. The Yiqu Kingdom was established at the end of the Western Zhou Dynasty. By continuously attacking the surrounding Xirong tribes, they built dozens of cities and sent soldiers to guard them. During the period of Duke Mu of Qin, Qin used the strategy of the Rong people to attack the Yiqu Country. They took down twelve cities in Yiqu and expanded their land by thousands of miles. However, the Yiqu Kingdom was not completely destroyed. It still existed and made peace with the Qin Kingdom. Later on, the Qin State adopted a policy of appeasement, roping in, and corruption. They had an affair with the King of Yiqu to limit the power of the Yiqu State. In 331 B.C., civil strife broke out in the Yiqu Kingdom. The Qin Kingdom took the opportunity to send troops to attack, and the Yiqu Rong surrendered to the Qin Kingdom. However, even if they surrendered on the surface, the king of Yiqu still caused trouble for Qin in the chaotic battle of the Central Plains. In 318 B.C., the Yiqu Kingdom betrayed the Qin Kingdom and paid tribute to the Wei Kingdom, which dealt a serious blow to the Qin Kingdom's plan to advance eastward. At this critical moment, Qin country adopted an ingenious method. In general, the relationship between the Yiqu Kingdom and the Qin Kingdom was one of love and hate. The Qin Kingdom had adopted many strategies to limit the power of the Yiqu Kingdom.
Definitely not. Manhwa comes from Korea. It has unique features that set it apart from Chinese comic works in terms of art style, storylines, and cultural influences.