Thus, he unflinchingly resigned his generalship of Tang Dynasty and returned to Shilla. After coming back to the home country he scouted around several areas. Then he reviewed which site was adequate for the military garrison and found out the sitting on the ground that:
‘My home island I was born is encircled by other big islands. It has a vantage point from the seasonal typhoon and rainstorms as well as a bifunctional military advantage strategically. From the island, we can easily make an offensive military movement and defend it from outside attack.’
So, he selected his homeland as main military fortress. Then he built sentinel and artillery posts there. He also built up several outposts here and there. Over time, the selected island and other bulwarks communicated each other by signs from barbicans. In this interim, he constructed formidable warships with tens of thousands of cavalry, infantry and sailors. Thus, all the fortresses, outposts, and bulwarks were a bi-fold military garrison with firearms and warships like a vast impregnable castle in the sea.
His headquarters was Jangdo (將島). It was a tiny island but connected with the selected island with the wooden bridge. Ramparted by earthworks, Jangdo was occupied by hundreds of combat units. It had four barbicans, four armored batteries, and several barracks. So it played a main role as one of his commands. Around Jando, lots of armored-clad ships harbored. Indeed, Jangdo became his naval headquarters with troops. From there, his seamen and soldiers could watch and control any ships moving in and out in every direction. But also, his military power came to overwhelm pirates in the sea and controlled the sea with his warships. Thereafter, Jando became a threatening snubber to ferocious pirates. Then and then, his seamen and soldiers could have pressed down tigerish pirates and saved innocent captives from the slavery. Then they released them as freemen. In this way, Jando and his other military garrisons maintained the public order and public security in the Yellow Sea all the time. Finally, he achieved his boyish hopes and great dream with new thinking & new possibilities. Then he could control over the sea as the Prince of the Yellow Sea.”
“Prince of the Yellow Sea”
While reading this part the boy (Cheong, Ju-young) was fascinated by his manly activities. Then he hurrahed and burbled:
“Aha, ah ha, really he must have been worthy of respect as a Superhero. He did not dream away his life in vain. With his private sea soldiers he waged the campaign of peace in the sea. Thanks to his devotion he came to earn the respect from the people at home and abroad. He really role-played his dream. It is more valuable and fascinating for a machismo to achieve a great dream. It was also a new thinking. The morning of his life was not bright but vegetable. But, with the new thinking he vaulted over it. Then he held the stage with indomitable courage and adventurous mind. In this point, for me, he was really a perfect dream. As a dreamer he daringly sought for his fortune and fame. Like him, I want to be a great man with new thinking & new possibilities. His dream is not a waking dream at all. It can be also applied to me.” (Later, ‘new thinking & new possibilities’became the catchphrase for the boy and his son.)
Further, the juvenile book aroused much amusement. The book said about his personal life with the common people as below:

“Especially, Chang Bo-ko, as a devout Buddhist, built several Buddhist temples in China and Korea for the funky and weak people. One of the temples he built stands still at the upland of island of Shidao with his statue by the Shandong peninsular, China. It is called Chi Shan Fa Hua Yaun (赤山, 法華院). Even now lots of the Chinese have visited there to meet and pray for the fortune from him.

Indeed, he was a lovable Prince of the Sea with stories of a romantic flavor. And he was a modest man without vaporings and empty airs. Thanks to his help a Japanese Buddhist could safely return to Japan and later became a chief monk of the temple of Enryakuji (延暦寺). He was Enrin(圓仁, 慈覺大師).
Later he wrote a reminiscence of Chinese Journey, the Record of a Pilgrimage to China in search of the Law, where he praised him for his sincere services and attitudes.”
Continuously the book said on the Prince’s colorful life with broad vision as below:
“Hearing at the news, tens or hundreds of countrymen began to get down from highlands and live around garrisons and outposts. Before military fortresses and outposts were built up, fishermen and countrymen did not live by the seashore. They dreaded living by the sea. At the time the sea was filled with lots of pitiless pirates. Sometimes, they got on the land, ransacked villages, burnt houses, killed or kidnapped innocent peoples as captives. Then they sold them as slaves to foreign lands. Thus, farmers and fishermen feared living near the seashore of the islands. Fishermen’s villages and wharf did not exist before he built up the garrison. They dwelt in highlands far away from the beach or coastline. But, now, the people did not have to worry about personal safety and daily lives any longer. Further, they could manage their jobs without any concerns.
Meanwhile, the Prince of the Yellow Sea came to notice and recognized that:
‘Now, the military garrison has another merit for international trade. Geographically, it is placed in the middle of the sea route of Korea, China, Japan, and other foreign countries. Its location is appropriate for a merchantable overseas business. Thanks to the already-established public safety and public order, such a business will be made as an overseas trade easily. Then it will be hopeful and helpful for the countrymen and neighboring countries’ merchants. If so, I had better set up an avenue of overseas business by using this military garrison with my battleships. The battleships will be able to escort merchant ships without any concern of pirates.’