This study investigates cultural differences between two nations (n = 249 from the USA; n = 185 from Korea) in relationships among judgment of message veracity, willingness to say a truthful or deceptive message, and estimations of others' judgments and actions. The overall finding is that one's judgment of message veracity is related to how one thinks others would judge the message. Similarly, whether individuals would say a truthful or deceptive message is related to their perception of whether others also would say the message or not. In general, the most noticeable cultural differences were observed for the message with clarity violation. Korean participants' veracity judgment and estimation showed similar patterns across the baseline (i.e., truthful) message and clarity violation message, while American participants' veracity judgment and estimation were different for baseline and clarity violation messages.