최선the best 개선improvement 최선책the best plan 친선friendship; amity 개과천선reforming one’s character; mending one´s ways 개선안improvement plan 개선책corrective measure 권선징악encouraging good and punishing evil 다다익선the more, the better 독선self-righteousness

도입introduction 유도inducement; guidance; induction 지도guidance; instruction 지도자leader; head 계도guidance; enlightenment 교도correctional discipline; rehabilitation 교도관prison guard; prison officer; correctional officer; corrections officer 교도소prison; jail 도입부introduction 도체conductor