This is the 4034th most frequent Korean word.
이후부터
"From now on" or "since then."
Here, '이후부터' indicates the time 'after graduation' to mark the starting point of job preparation.
저는 대학 졸업 이후부터 취직 준비를 시작했습니다.
I started preparing for a job after graduating from university.
In this case, '이후부터' denotes the period following 'the accident,' specifying when the change in characterization began.
그 사고 이후부터 그는 조심성이 많아졌습니다.
Since that accident, he has become more cautious.
Here, '이후부터' points to the phase after 'preparing in advance' as the starting point for work progress.