"Cocoon group" is "코쿤족"(ko-kun-jok) in Korean.
코쿤 means Coccon in English 'cocoon', that of "chrysalis (pupa)". As in the pupae confined to cocoon, it refers to a person who confined in a safe world. And safe world, mainly my room, or it is possible of spend time alone, to live to avoid the complex human relationships and negotiation. So-called "Hikikagomori ( 은둔형 외톨이/Eundun Hyeong Oetol-i ) "completely, rather than confined to his shell like, but on a daily basis are engaged in the social life and economic activities, one person leisure sends a single life in single-person households I say that those who enjoy in. Such cocoon group and are also made marketing that target.