V-게 되다
This pattern describes a change of state, result, or new situation that happens because of circumstances, not a direct decision. In the story, it shows that the narrator ended up with a different mindset after the day’s events. You can reuse it when describing becoming more careful, more interested, more confident, or otherwise different over time.
그 일을 겪고 나서 나는 사람을 더 조심해서 대하게 되었다.
After going through that, I became more careful in the way I treated people.
