Cheon Osu, a merchant from Gaeseong, is heading to Zhamen in China to sell dried sea slugs with his sworn brother, Gil Sangmun. The future of his business depends on this journey, which hes taken his young children, Bongsam and Sorye, as well as Sangmuns son, Sogae on. In the meantime, Kim Hakjun, a loan shark, has a plan to destroy Mr. Cheons Gaekju in Zhamen. This drama features the heaven-sent merchant in Joseon Cheon Bongsam. He is the heir of Mr. Cheons Gaekju, who gets his start as a decoy, becomes a manager and eventually the chief of his business.