"Can you imagine what it's like cutting the same head for five years? I didn't want to be a barber anyway. I wanted to be a lumberjack. Leaping from tree to tree as they float down the mighty rivers of British Columbia. The giant redwood, the larch, the fir, the mighty scots pine! The smell of fresh-cut timber! The crash of mighty trees! With my best girlie by my side. We'd sing! Sing! Sing!"
Your character has a perfectly normal job. The job can be solid if slightly boring. The job can be really stultifying. The job can be extremely well-paying and respectable. However, your character knows at heart that it doesn't feel self-fulfilling.
Ultimately, they decide to give it all up and pursue their dream job, usually with creative streak like music, art, writing, or they want to become professional athletes. Sometimes their wish is more mundane, for instance they might want to open their own business. Alternatively, they want to embrace a simpler life or to follow the irresistible call of the wild. If your character chooses farming, then it's Call to Agriculture.
Characters often make huge strides towards their dream career during a Hard Work Montage. Compare to Out of Job, Into the Plot. Contrast with Desperately Looking for a Purpose in Life.
Examples from media:
Anime and Manga
Inverted in Black Heaven: It opens with a bored and unfulfilled salary man who used to be a rock star; he gave up his musical career for a steady office job so that he could support his family.
The main character of One Punch Man quit being a run of the mill salary man and trained for three years so he could take up superheroing as a hobby.
Space Brothers: After being fired from his job, Nanba Muuta opts to pursue his dream to walk on the Moon with his brother as astronauts, and then to be the first man on Mars. The story is about their experiences getting to those goals.
Films - Animated
In Robots, Rodney's father wants to be a musician. At the end of the movie, he gets his big chance. Turns out he can't play.
The construction worker in the "Rhapsody in Blue" sequence of Disney's Fantasia 2000 eventually quits his job, during The Great Depression no less, to pursue his dream of being a jazz drummer.
Metro Man gets tired of being a super hero and doing what everyone expects him to do, so he quits by faking his death and planning to go into the music business under the name Music Man. He's not very good at it.
Megamind himself is an inversion. Being a supervillain was his dream job. When that didn't work out, he became a superhero instead.
Ratatouille: A rat named Rémy is a cooking genius and he longs to become a chef. He gets his chance to cook at the restaurant founded by his idol, Auguste Gusteau, where he gets his cooking experience and fame.
Films - Live Action
Juno: Mark is interested in music and works as a successful jingle composer. Later in the film, he informs his wife Vanessa that he leaves her and moves down town to become a rock musician as he has always wanted.
Aspen Extreme: Man working as a machinist gets an offer for a promotion. He takes this opportunity to quit, going for his dream job as a ski pro.
Universal Pictures' Hop featured E.B. refusing to inherit the mantle of The Easter Bunny, escaping instead to Los Angeles seeking to become a drummer in a band.
My Big Fat Greek Wedding: Toula Portokalos works in her family's Greek restaurant. When she is in her early thirties, she decides to invigorate her life. She goes to college and starts working at a travel agency.
In October Sky Homer takes a job in the town's coal mine after it seems his hobby of rocketry has caused a forest fire. He does well there but when he figures out the fire started too far away for a rocket to have started it, he begins pursuing rocketry again, determined to get out of that town and go to college. He eventually goes to work for NASA.
This is the premise of George Orwell's Keep The Aspidistra Flying: an advertising copywriter quits his job to turn his back on the world of money and become a poet. He gradually discovers that having no money sucks.
Monica's then-boyfriend Pete, an uber-rich businessman, gives up business to become an Ultimate Fighter.
Subverted with Chandler who works as a data analyst for a corporate organization but he has always assumed it's temporary. When he's offered a promotion, he quits because he doesn't want to get stuck there. However, he has no idea what he'd like to do instead and the money they offer him is too good, so he returns.
Played Straight in later seasons when Chandler learns he's the only one of their gang who hates his job, and pursues a new career in advertising. It seems to have been chosen rather randomly but he really likes it. However, he has to start at the bottom of the career ladder.
Phoebe's Love Interest Mike used to be a lawyer, however, he decided to become a professional pianist in his early thirties. It helps that he has some family money.
The Joe Schmo Show third season, the Full Bounty. The chosen "schmo" for the season (he's the only "real" person on the reality show, the other competitors are actors) already owned a successful business but nevertheless went on the show, believing he was competing for a dream job to work as the understudy of a world famous bounty hunter named Jake Montrose, and eventually perhaps gain similar fame.
A barber gives it all up to become a lumberjack. He has a hair phobia and he never really wanted to be a barber anyway.
A chartered accountant wants to pursue a career as a lion tamer, but he is discouraged from doing that by a vocation guidance counsellor, who says his aptitude test shows he's perfectly suited for a career in chartered accountancy. Sadly, his ideas about lions are also quite twisted.
Counsellor: Your report here says that you are an extremely dull person. You see, our experts describe you as an appallingly dull fellow, unimaginative, timid, lacking in initiative, spineless, easily dominated, no sense of humour, tedious company and irrepressibly drab and awful. And whereas in most professions these would be considerable drawbacks, in chartered accountancy they are a positive boon.
In Red Dwarf, Dave Lister's dream is to one day move to Fiji and open a Hot Dog Stand. He's a lazy slob who works as a third technician, repairing vending machines on Red Dwarf, a giant spaceship of the Jupiter mining company.
Gilmore Girls: Lorelai and her best friend Sookie share a dream of opening their own hotel one day, and they are slowly working on it. At the beginning of the series, Lorelai is a hotel manager, while Sookie works at the same hotel as a very talented chef. Later they buy a historical inn called Dragonfly, they renovate it and start running it to a great success.
The Office (US): In the ninth season, Jim decides to become the co-founder of a new business in Philadelphia.
Many episodes of Time Squad involve a historical figure changing to another field of work - such as Beethoven becoming a pro-wrestler or Albert Einstein a used car salesman - and it's up to the Squad to get them back in track and keep the timeline stable.
The episode "And Maggie Makes Three" revealed that Homer once quit the Springfield Nuclear Power Plant to become a pin-monkey at the local bowling alley as soon as he got out of debt. Once he learned that Marge was pregnant with Maggie, however, he tried to get a raise by attracting more customers, but was ultimately forced to give up the job and go back to the power plant.
Ned left his job as a company clerk to open a store for left-handed people.
In The Fairly OddParents episode "Dread 'N' Breakfast", Timmy's dad left his current job in order to make and sell sock monkeys.
The author of Tsuribaka Nisshi stopped being a bank teller, and instead decided to become a Mangaka despite knowing how difficult it would be at his age.
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it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
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