There is a costume drama about an emperor who lost his memory and went to the common people. There was a person named Chuqi and another named Xiaoqing.

This TV series is called "Wandering in the Sea". I have watched it before

Plot summary: A wealthy man from the south of the Yangtze River was noble. Because of his youth and frivolity, he offended the emperor and lost all his wealth in one day. He became a commoner and was forced to start over by selling sesame seed cakes. Eighteen years later, Gao Shang moved to the capital with his dependent daughter Xiao Qing to continue his pancake business. Gao Shang always wanted to earn a hundred thousand taels of silver and avenge his previous shame.

The noble "Happy Shaobing Shop" finally opened, but troublesome things followed one after another. The sales of the sesame cakes were very poor due to their poor taste; the boyfriend of her daughter Xiaoqing's dream turned out to be the rich man Wu Wencai, a notorious bully in the capital and the mortal enemy of the nobles; he inexplicably adopted a mentally retarded idiot named Chu 7. He got into a lawsuit for no reason and was forced to rent half of the shop to his enemy, the porridge-selling girl Jinzhu. Although Jinzhu is extremely aggressive and sharp-tongued, she has a kind heart. Unfortunately, she was abandoned by Hua Wenzhuoqun, the number one scholar in military affairs. The four of them lived under the same roof, making a lot of noise and making a lot of jokes. After the tragedy, Gao Shang and Jin Zhu exchanged feelings for each other. The two jointly opened a porridge and cake house, and joined forces to battle wits and courage with the acrimonious and snobbish Wu Wencai and the treacherous Wen Zhuoqun. After going through all kinds of difficulties, Gao Shang finally baked "Happy Shaobing" with the support of Xiao Qing and Chu Qi in Jin Zhu, and with excellent color and aroma, which became famous in the capital.

However, the ill-fated Gao Shang did not expect that he would be involved in a political conspiracy in the court because of his adoption of Chu Qi. Chu Qi was originally the prince of the current dynasty. He was framed by foreign spies and mistakenly took the highly poisonous drug Forgetting Water, causing his intelligence to drop to the level of a young child. Although Gao Shang protected Chu Qi in every possible way, strange disasters continued one after another, and he himself was imprisoned.

The exposure of Chu Qi’s identity also triggered emotional entanglements among several young people. When Xiao Qing woke up from her dream, she determined that Chu Qi was the one she loved, and she had been secretly protecting the prince for a long time. Liu Anguo also has a crush on Chu Qi. Chuqi fell into distress and had no choice but to avoid going to Fanbang as an envoy. Unexpectedly, Fan Bang had already coveted the great rivers and mountains of the Central Plains, and colluded with the treacherous officials in the DPRK. Chu Qi was trapped in Fan Bang.

This disaster made Gao Shang understand that the relationship between children is less important than saving the country and the people. Gao Shang can no longer just sell "Happy Shaobing". If the country is gone, where will the family be? The crisis aroused Gao Shang's sense of responsibility and patriotism to save the country and the people. Gao Shang's eighteen-year old grudge with the emperor also disappeared with a smile. Every man is responsible for the rise and fall of a country, how much more noble is the king of sesame cakes? Gao Shang decided to go to Fan State to rescue Chu Qi. Just when the war between the two countries was about to break out, Wu Wencai fell in love with Princess Yinhu of Fan State at first sight, and later became friends with Qin and Jin, thus eliminating the war between the Central Plains and Fan State.

After everything settled down, Gao Shang and Jin Zhu finally got married and continued their happy common people life. Liu Anguo's withdrawal made Chu Qi and Xiao Qing happy. On the seventh day of the lunar month, he ascended the throne and decided to govern the country with benevolence and became a wise king. Only when the country is prosperous can the people live and work in peace and contentment... As the saying goes: if the country is peaceful and the people are happy, everything will be prosperous if the family is harmonious.