It's Better If Gabriela Doesn't Die (2007)

Miguel, ayou young soap opera writer promises Bracho, a fanatic cop that the outcome of the soap will be Gabriela Marrying Domenico. Bracho boasts and shows off about this to his friends and family. No one believes him and he places a bet. The actress playing Gabrilea quits the show and they give her a terminal illness. When Bracho finds out he hunts Miguel down and makes it clear: it's better if Gabriela desn't die.