I can't answer this question exactly. However, economic principles tell us that whether things can make money depends on market demand and supply. If many local people like to eat roasted sweet potatoes, and the supply is relatively small, then in this case, opening a roasted sweet potatoes store is more likely to make money. But if the market demand is not high, or there are too many suppliers and the price is very low, it is likely to be difficult to make a profit. So, if you are interested in opening a roasted sweet potatoes store in Dalian, you need to conduct market research and competitive analysis to decide whether this business has a bright future.