Apariencias (2000)

Carmelo, who is 30-years old and extremely shy, finds it difficult to reveal his innermost feelings to Verónica, his coworker. His world collapses when he finds out that she is engaged to arrogant yuppie Federico. Accidentally, she spots him demonstrating in a gay rally where he accidentally becomes a leader of that cause. Of course, Verónica assumes that Carmelo is gay, and he takes advantage of this misunderstanding to overcome his shyness and play a game of lies that will lead them to a most unpredictable ending.