I am back for good. (나 완전히 돌아왔어)

seemingly: 외견상으로는, 겉으로는.

a seemingly harmless dog.

apparently: 보아하니

Apparently, he is tired. (보아하니, 걔 피곤하네~.)

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I can't seem to stay away from here. The food is just too good.

can't seem to : it seems like I can't (~못 하는 것 같아)

I can't seem to lose weight.

She can't seem to save money.

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She is leaving for good. 

Are you leaving Korea for good? (완전히 돌아가는 거야?)

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travel bug: 여행을 좋아하는 상태.

In British English, the slang word "bug", in the above given context, means an illness or a disease which is usually infectious.

So, a "travel bug" is an illness or a disease which compels the infected person with the desire to travel.

Please note that, although I have used words like "illness" and "disease" to describe it, the term "travel bug" itself does not have any negative connotations.

In fact, it is usually a positive thing to catch the travel bug

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Even as a kid, I never lived in the same city very long.

as a kid => 어렸을 

I think moving around a lot really stuck with me as an adult. 
(stick with: 몸에 배다, 유지하다.)

Let's stick with our original plan.