This study confirms that consumers' intention to participate in boycott movements, a phenomenon recently garnering significant attention, can vary depending on individuals' construal level. Previous studies primarily explored societal factors that directly influence the intention to participate in boycotts. However, this study focused on consumers' participation in boycotts from the perspective of goal achievement. Specifically, we aimed to investigate the impact of consumers' perceptual differences regarding boycotts as a collective goal on their intention to participate in boycotts. Particularly, we confirmed that the optimism bias, which appears according to consumers' construal levels, can also be applied in boycott research. The results of the experiments are as follows: participants with a high construal level perceived a higher likelihood of boycott success compared to those with a low construal level, leading to a decrease in purchase intention toward brands associated with the occurrence of a boycott. Furthermore, it was observed that these effects did not differ based on the type of boycott (unethical behavior price vs. unfairness). The purpose of this study is, first, to confirm the relationship between consumers' boycott participation intention and optimism bias. Second, we aim to derive practical implications by examining the impact of consumers' level of interpretation on the likelihood of boycott success and confirming that this applies to two different boycott situations (e.g., price increase vs. ethical issues).