The grass is always greener on the other side.
People are never satisfied with their own situation; they always think others have it better. (남의 떡이 커 보인다)
A bad workman blames his tool.
someone says that something they have done is not of good because they did not have enough skill. (실력 없는 사람이 남 탓 한다.)
Do not count your chickens before they hatch.
you should not depend on something that has yet to happen. (설레발 치지 마라.)
