Abstract: A compound represented by Formula 1 according to the present disclosure, when used in combination with an anticancer drug, may significantly improve the anticancer effect of the anticancer drug, and may induce the same anticancer effect even when the anticancer drug is used in a significantly smaller amount than the conventionally used amount, thereby reducing the side effects caused by administration of the anticancer drug. Furthermore, the compound represented by Formula 1 makes it possible to effectively prevent, alleviate or treat either anticancer-resistant cancer or cancer which recurs or metastasizes after anticancer drug treatment.