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The self-concept of ethnic Chinese and ethnic Bugis-Makassar in self-disclosure activities in Makassar City is formed based on the perspective of the closest people and others in attachment style. As such, this study is to identify the extent of the category of the self-concept and attachment style of ethnic Chinese and ethnic Bugis-Makassar in the development of self-disclosure and interpersonal communication activities.  This research uses qualitative research methods with a case study approach, where the data collection is carried out through observation, in-depth interviews, and do cumentary studies relevant to Chinese-Makassar subculture research. Further, the self-concept of ethnic Chinese and ethnic Bugis-Makassar in self-disclosure activities found in this study is a prominent characteristic of ethnic Chinese and ethnic Bugis-Makassar informants, such as sociability, ease to cooperate, commitment, considering the treatment of people towards them, with styles of secure attachment, a combination of secure attachment and insecure attachment.  Moreover, the combination of secure attachment style and insecure attachment style is characterized by a semi-open attitude in self-disclosure as shown by ethnic Chinese, while the style of secure attachment is characterized by an open attitude shown by the Bugis-Makassar ethnicity and these self-concepts and attachment styles can improve humanistic communication.

Self-disclosure; self-concept; attachment style