一反其道

Explanation: A whole, complete; anti-reverse; other; Road track. Completely contrary to the previous track. 　　Usage: Verb-object type; as predicate, adverbial; means a complete change 　　Examples: He always liked an opposite direction. Thesaurus:  forsake darkness and come to the light, mend one's ways, cut loose from the past and make a fresh start, To refuse the evil perfection, Gai Xian Yi Zhang, An anti-past Antonym Group:  Qimingtouan, cast pearls before swine, cast pearls before swine, Branch road Sheep, divagate