I assumed an ordinary person. My parents use the “한영키” to switch between Hangul and the alphabet. While I’m geeky enough to configure my Caps Lock key to function like that switch, most people wouldn’t even imagine that functionality is configurable.

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If you’re okay with ibus-hangul, you can configure the keyroard shortcut for Gram.

Click “Add” and press “한/영” key on the keyboard.

ibus

​All Korean keyboards, including the one on my LG Gram (which is a Korean model), have a dedicated key for switching between English and Korean (the “한영키”). Everyone who isn’t technically inclined uses this key. Using Ctrl + Space is a bad user experience.