시절이 · 시절을
days, time, period (of one's life)
Example
대학 시절에 친구들과 여행을 많이 했어요.
In my college days, I traveled a lot with friends.
Word parts
시 time+절 season
Literally 'time and season.'
Good to know
It usually refers to a past period, often with nostalgia: 그 시절 (those days).
Related words