기필코 + -겠다/-고 말겠다 (strong resolve)
without fail, no matter what, definitely
Example
이번 시험에는 기필코 합격하고 말겠어요.
I'm going to pass this exam no matter what.
Word parts
기 expect+필 surely
Literally 'set on certainty' — determined, no matter what.
Good to know
Expresses strong determination, often with -고 말겠다.
Related words