Hi, in this case Ling would be liable. You have a store owner, who is considered to open his premises to the general public (who are considered invitees) and to, therefore, owe a duty to that public to make his premises safe for them to be inside. A reasonable store owner would know that he needs to fix any dangerous situation, such as water puddles that can make the entrance slippery. Here Ling failed to do that. That means that he breached his duty. That breach caused injury to Kim and her injury was both foreseeable and the direct result of Ling's negligence. You can learn more by reading the source here.