"Eodieseo naeryeoya twaeyo? (어디서 내려야 돼요?) means where *do* I have to get off?" - Yes. "Doneun eodiseo naejyo? (돈은 어디서 내요?) means where *do* I have to pay?" - Yes~ "As far as I know, eseo(에서) particle can be put if we want to show an action, so we can put eseo particle in front of a verb and in back of a noun, is it right?" - I understand what you mean. To make it more clear, the 'eseo' particle is used to indicate the place the action happened. For example, we say 'jibeseo jatsseo(집에서 잤어요) = I slept in home', not 'jibe jatsseo(집에 잤어)'. You can say 'jibe itsseoyo(집에 있어요) = I'm at home'. But I don't know the function of only seo particle, is seo particle and eseo particle have the same function? - Yes, but for nouns ending with the consonant, the 'eseo' particle is always used after the nouns.