정계가 · 정계를
political world, political circles, politics
Example
그는 사업을 그만두고 정계에 진출했어요.
He quit his business and went into politics.
Word parts
정 politics+계 world
Literally 'politics world'; -계 = field or circles: 정계, 재계, 학계.
Good to know
Common collocations: 정계에 진출하다 (enter politics) and 정계를 은퇴하다 (retire from politics).