1. the grass is greener on the other side 남의 떡이 커 보인다; other people's circumstances
seem more desirable than one's own
2. culture shock 문화충격; a condition of confusion and anxiety affecting a person
suddenly exposed to an alien culture.
You're suffering from culture shock.
3. not set in stone 바꿀 수 있다; to not be fixed and able to be changed.
My plans aren't set in stone.
4. wake-up call 예고; a sign or warning to take action concerning something that was
overlooked or neglected.
He was having a heart attack.
I bet it was a real wake-up call for him.
5. on a whim 충동적으로; a sudden desire or idea, especially one that cannot be
reasonable explained.
I applied for a job on a whim and I just got the position as an editor.