How do i say "i will protect"in korean (romanised) or similar phrases will do?

Both of these can work.

Na neun boho halgushida.

Na neun jikil gushida

EDIT:

What she said works too and sounds a bit more feminine. What I said is more standard dictionary form/used more by men. It really depends.

And she is wrong, what I said is INDEED in "future" tense, not present tense. If it was present tense, it would be "bohohanda" "jikinda"

What she said can work both as future and conditional form, depending on the context.

What Jjandsaid is in present form. So, it will actually mean I am protecting.

You havetwo choices.

[1] I will protect- (is writtten) 내가 지킬깨- (pronounced as) neh- ga-ji-kill-keh

[2] I will protect- (is writtten) 내가 보호할께- (pronounced as) neh-ga-bo-ho-hal-keh.