Started that new show My Strange Hero (really good so far) and was curious to know if there are any shows where something happens to the male lead, by maybe the FL/SML and others and the male lead conduct a revenge plan against them. He hates the FL during the beginning of his revenge plan, but then falls for/back in love with her if he loved her in the past.

A drama similar to that is 

The Last Empress (its currently airing and you can find it on Viki and Kocowa. it airs every Wednesday and Thursday and the subs on kocawa for the show come pretty fast.) The male lead in The Last Empress is taking revenge against the second female lead and the second male lead. It's a modern drama with the dramatics of a historical drama. Its a fun drama to watch.

  • Secret
  • Le Jun Kai
  • Golden Empire

In Addition:

  • Kleun cheewit - ML hates FL
  • Queen of the Game - revenge on the FL's father and ML uses FL
  • a story of a man - ML set up revenge against SML
  • Princess Man  - doesnt start out as full on revenge but after a few episodes ML hates FL's father and in connection the FfL . Because of what FL's father did
  • Money Flower - ML revenge on a family and uses FL as one of his pawns

A Man's Story ML against (revenges) SML and FL

Giant same (though there are 2 female leads, one is MLs sister another love interest, ML's revenge targets are SML and his father and for some time FL becomes enemy too. also there is very very good romance story of SML and... I wont say, also lovers/enemies relationship)

A Love to Kill ML's revenge target is FL