mercenary
Definition
Motivated by a desire for money or other personal gain rather than loyalty or principle; a professional soldier hired to serve in a foreign army.
한국어 돈이나 개인 이익을 위해 충성이나 원칙보다 동기를 부여하는 사람; 외국 군대에 고용된 전문 군인
Example
"He was criticized for his mercenary attitude toward his career choices."