Odd use of も has me stumped 「ソウルにいるのも今夜きりです」


So I'm working through Makino and Tsutsui's _Dictionary of Advanced Japanese
Grammar_ , and I came across this sentence:

> ソウルにいるのも今夜きりです。  
>  This is my last night left in Seoul.

The entry is about teaching きり, which I understand just fine. What I can't
work out is how も is being used here. 'Being in Seoul'も'This is the last
night'. I can't see how this can mean 'even' or 'also' or any other definition
I've looked at. I was thinking it must be a typo for もう, which would make
sense.




I listed up several examples that I can use ‘も.’ in the sentence, but I cannot
think up how I should incorporate the nuance of ‘も’ into English.

Even if I omit ‘も,’ from the following examples, you can understand or guess
what I mean, but they sound sometimes awkward without “も.”

> 冗談も程々に - Refrain from joking.
>
> 今にも雨が降り出しそうだ - It’s going to start raining right now.
>
> 雨も上がった。さあ出かけよう - It stopped raining. Now let's go out.
>
> 桜も今週いっぱいだ - Full bloom of cherries will end by this weekend.
>
> 試験も終わった。これで羽を伸ばせる - The exam is over. Now I can fully go on the loose.
>
> ローマも見[納]{おさ}めだ - This is the last time I see Rome.
>
> 君との付き合いもこれで終わりだ - (All done.) I have to break off our relationship.
>
> 明日にもここを発たねばならない - I have to leave here tomorrow.
>
> いかにもあなたの[仰]{おっしゃ}るとおりです - True, you are exactly right.
>
> 100万円も使い道がない - Though I have ¥1 million, I don’t find the right way to use
> it.

Among the above examples, there's no problem to replace 冗談も with 冗談は, 桜も with
桜は, 試験も with 試験は, ローマも with ローマは, 君との付き合いも with 君との付き合いは, 明日にも with 明日には, and
there wouldn't be much difference in meaning between two different ways of
saying.

As I’m not a grammarian, I’m unable to explain logically what the functions
and definition of “も” are. I’m sure somebody else can. But it seems to me “も“
is used to emphasize the preceding noun, adverb, i.e., words such as
冗談、今、雨、桜、試験、ローマ、付き合い、明日、いかに、and 100万円, like say, "this very" in English.

