개교establishment of a school 개교기념일school anniversary 개교식school opening ceremony 개발development; exploitation 개발비development expense 개방opening; opening to the public 개봉관first-run theater 개봉작new release 개업의private practice physician 개원opening of a hospital; opening of an institute

천고마비autumn 천국heaven 천사angel 천장ceiling 천재genius 천재적genius 천재적talented; gifted 천주교Catholicism 청천벽력bolt from the blue 총천연색all natural color

계절season 명절national holiday 사계절four seasons 계절병seasonal disease 계절성seasonality 계절적being seasonal 계절적seasonal 기본예절basic manners 시절days; the time 예절courtesy; manners