Sometimes, there are people in their 30s and 40s who live with suppressed anger.

‌Some people just look like they are outwardly projecting the anger they hold inside at a single glance...
There are those who seem to have a concentrated aura of "if you touch me, I'll kill you," and you can desperately feel the anger and resentment dwelling in their hearts.
Even when they speak, that emotional state carries through their tone of voice continuously.
What ultimately happens to these kinds of people?
As time passes, does that "residue in the heart" disappear, and do they naturally find their own sense of peace?
Or do they truly end up falling ill from living in such anger?
I am curious if anyone has observed someone like this closely over a long period of time.