책임이 · 책임을
responsibility; blame, fault
Example
이번 일은 제 책임이니까 제가 해결할게요.
This is my responsibility, so I'll take care of it.
Word parts
책 duty, blame+임 entrust
Literally 'entrusted duty.'
Good to know
책임을 지다 or 책임지다 means 'to take responsibility'; 책임자 is the person in charge.