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Recently I explained the use of "ㅋ". This time, I would like to introduce the word "낚다", whose and its passive form is "낚이다". This word mainly means to catch fish with a fishing rod or a net. But it has another important meaning: to fool someone. It probably compares fooling someone to catching fish. You may think this expression is very offensive. However, we often use it in daily life just in a humorous way.
For example, I watched the horror movie "The Conjuring" last night. The Korean translation of the poster definitely said, "Terrifying Without Any Horrible Scenes" and a person said something like that on a movie review site. The review and the phrase on the poster made me think that the movie would focus on only the mysterious "story". But I was completely fooled.. Actually, the movie featured some ghosts, so I was greatly surprised! (startled indicates fear but you are focusing on the difference in your expectations for the movie and what the movie actually showed) In this situation, I could say "낚였다", the past passive form, like "포스터에 완전 낚였다.". (However, we don't say "포스터가 나를 완전 낚았다." because Korean tends to limit the use of inanimate subjects.) This expression is quite common but I don't think I have never seen foreign learners use it. It holds the key to speaking Korean like native speakers.