Select 'Priority only' in 'Do not disturb' mode to only use sound and vibration for priority apps.
Notifications from other apps are blocked.
1. Turn on 'Do not disturb' in Settings> Do not disturb mode.
2. Set 'Sounds and vibrations' to 'Calls and notifications.'
3. Turn on Kakao Talk in 'Select priorities> App notifications.’
'Do not disturb' mode can be simply set on or off in Quick settings of the notifications panel.