- Friendly Fandoms: With Strangers From Hell, another (though much less comedic) thriller starring Lee Dong-wook.
- Fight Club, which also focuses on a down-on-his-luck guy who ends up meeting a cool and suave guy who is his Imaginary Friend / Split Personality.
http://tvtropes.org/pmwiki/pmwiki.php/Ymmv/BadAndCrazy
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