Ruminations regarding negative content are highly associated with depression and depressive disorders. Lately, researchers have started investigating the relationship between rumination and metacognition. Metacognitive awareness, which is necessary to objectively recognize and distance oneself from negative thoughts, including ruminations, holds significance. However, there have been limited studies attempting interventions that specifically focus on ruminations. Therefore, in this study, the researchers conducted interviews following an intervention aimed at externalizing rumination thinking. The researchers investigated the following: (1) whether changes in metacognition were observed as a result of the intervention of externalizing thinking; and (2) whether the intervention of externalization changed the way individuals think about rumination and deal with it. Additionally, the researchers investigated how metacognition worked and brought about changes with regards to coping and socializing by utilizing rumination. Consequently, participants developed an awareness of their tendency to ruminate during and after the intervention. Moreover, the comments received revealed shifts in coping strategies and thought patterns concerning rumination. These results suggest that the externalization intervention might have brought about some modifications in metacognition, potentially influencing rumination-related thought processes through metacognition.