도
do
도 is not 'also' — it is a hand adding one more
The picture A hand setting one more thing on a pile that already exists. Nothing new is started — something is added on top.
Where the picture shows up in 도
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one more on top
저도 같이 갈게요.
jeo-do ga-chi gal-ge-yo
I'll come along too.
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today on top of yesterday
오늘도 잔업이에요.
o-neul-do ja-neo-bi-e-yo
Overtime again today.
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even the bottom one
바빠서 점심도 못 먹었어요.
ba-ppa-seo jeom-sim-do mot meo-geo-sseo-yo
I was so busy I didn't even get lunch.
점심을 못 먹었어요 is just the fact; 점심도 adds the sting of 'not even that'.
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the pile overflowing
두 시간도 넘게 기다렸어요.
du si-gan-do neom-ge gi-da-ryeo-sseo-yo
I waited over two hours.
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this one and that one
카드도 되고 현금도 돼요.
ka-deu-do doe-go hyeon-geum-do dwae-yo
Card works, and cash works too.