In the year of King Chung-jo, Jeong Yak-quan (played by Seol Kyung-gu) was sent to the remote Black Mountain Island due to the impact of the Xinyou persecution incident. After arriving on the island, Ding Ruoquan became very interested in the marine life here and decided to write a book about marine life. He sought help from Changda (played by Bian Yaohan), a young fisherman who was born and raised here and was familiar with various marine life, but Changda initially refused because Ding Ruoquan was a guilty person. Later, Ding Ruoquan learned that Changda often encountered difficulties in the process of learning literacy on his own, so he proposed to teach each other the knowledge they were good at. Changda finally agreed, and the two also became each other's mentors and helpful friends in the collision. However, Ding Ruoquan was greatly disappointed after learning that the purpose of Changda's study was to pursue an official career. Changda also understood that the two had their own ambitions, and the two, who were both teachers and friends, decided to part ways...
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