be only visited by green bottle flies after death—a person who has no friends in his lifetime will have no mourners after death
青蠅吊客qīnɡ yínɡ diào kè
青蠅:指蒼蠅;吊:憑吊。比喻生前沒有什么知己,死后只有蒼蠅來吊唁。nobody else attended sb.’s funeral, a lone person who has not had a single friend during his or her lifetime