~まで (even)
Include something surprising or unexpected
You'll be able to use まで to emphasize that even an unexpected person, thing, place, or extent is included.

祖父までゲームに参加しました。
sofu made geemu ni sanka shimashita.
What do you think this sentence means?
Even my grandfather joined the game.
Include an unexpected extreme
まで can mean even when it adds a surprising person or thing to what is already true. The surprise comes from including something beyond the expected range.
靴の中までぬれました。
kutsu no naka made nuremashita.
Even the inside of my shoes got wet.
Form and use ~まで (even)
This is not the endpoint meaning “until” or “as far as.” も can simply add another item; まで emphasizes that even this unexpected case is included.
靴の中までぬれました。
kutsu no naka made nuremashita.
Even the inside of my shoes got wet.
先生まで笑いました。
sensei made waraimashita.
Even the teacher laughed.
近所の子どもまでその歌を歌っています。
kinjo no kodomo made sono uta o utatte imasu.
Even the children in my neighborhood are singing that song.
大雨で、かばんの中の本までぬれてしまいました。
ooame de, kaban no naka no hon made nurete shimaimashita.
In the heavy rain, even the books inside my bag got wet.
今日は暑いので、いつも元気な犬まで寝ています。
kyou wa atsui node, itsumo genki na inu made nete imasu.
It's so hot today that even our usually lively dog is sleeping.
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