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Purpose: It's the heyday of trot. TV Chosun's trot program has changed the trend of the Korea music scene. The trot genre was the periphery of the Korea music scene. However, the trend in the Korea music scene has been replaced with the highest ratings of 35.71% for the "Tomorrow is Mr.Trot" program. The ratings on the general programming channel were phenomenal. This study extends the findings that recent trot success factors are due to the moderate incongruity effect. It is a study that confirms who the success of trot using the moderate incongruity effect was appealed to. Research design, data, and methodology: This study was conducted using experiments. 2 (need for cognition: low vs. high)×3 (nostalgia type: congruity vs. moderate incongruity vs. incongruity). The experimental design is a mixed experimental design. In the experiment, the manipulated variable is the nostalgia type. The stimulant used in the experiment is the trot song. The subjects are in their 40s or older. Results: This study suggested that the moderate incongruity effect of nostalgia is suitable for people with high need for cognition for those with high need for cognition, it was effective to approach nostalgia, which was consistent with expectations. Apart from the statistical significance, the difference of the evaluation was evident in congruity, moderate incongruity, incongruity. For those with low need for cognition, nostalgia who approached expectations as a moderate incongruity was the most effective. There was no difference between congruity and incongruity. Conclusions: Nostalgia is an area of emotion. The moderate incongruity effect is a rational area associated with the pursuit of novelty. The mechanism of moderate incongruity effect is to reject cliche and seek novelty. It showed the possibility of rational access to the nostalgia. The rational use of emotional nostalgia is the implication of this study.