About -건가/거지
,I've been translating a Korean comic, and says things like '어떻게 뒨 거지?' or '무슨 일 이 생긴 거지? and '진짜 죽은 건가?

I have tried to find its meaning but I could not find its exact definition, the translator does a good job translating, but I not trust him totally,

I thank you for their help ^^I have tried to find its meaning but I could not find its exact definition of 건가 and 거지

Question

About -건가/거지
,I've been translating a Korean comic, and says things like  '어떻게 뒨 거지?' or '무슨 일 이 생긴 거지? and '진짜 죽은 건가?

I have tried to find its meaning but I could not find its exact definition, the translator does a good job translating, but I not  trust him totally,

I thank you for their help ^^I have tried to find its meaning but I could not find its exact definition of 건가 and 거지

Answer

거지 is colloquial short form for 것이지
composed of 것이다+지
used for asking about some happening.

건가 is colloquial short form for 것인가
composed of 것이다+ㄴ가
used for asking oneself or assuming about an event.

Answer

어떻게 된거지?, 무슨 일이 생긴거지? => What happen?
진짜 죽은건가? => Is he/she really dead?

HTH