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Man accused of murder says gal pal made up story to save her marriage

An architect arrested for plotting to shoot up a high-end Soho design firm says his married ex-lover made up the whole story so he wouldn’t tell her husband about their tryst.

Kon Jang — whose Manhattan trial starts Monday — told The Post that then-gal pal Sodam Ha said he was “planning a mass shooting at work” in April in the hopes that he’d be fired and sent back to Korea.

Ha, 33, told cops about a diagram Jang allegedly scrawled, marked with “X”s for potential victims at CetraRuddy, the posh firm where they both worked as architects. He was angry because he was about to be fired, she said.

Jang’s lawyer, Howard Myerowitz, said his client’s only crime is falling in love with the wrong woman.

“What he’s guilty of is having an affair with a married woman,’’ Myerowitz said. “He is here on a work visa, and she probably figured the easiest way to get rid of him is to get him fired: He doesn’t have a sponsor and he gets sent back to Korea.”

Jang was originally slapped with one felony count of making terrorist threats and misdemeanor harassment, but prosecutors dismissed the top charge because of a lack of evidence.

His lawyer and court papers show that the weapon Ha accused Jang of planning to use was actually an inoperable BB gun.

Jang was never going to be fired, documents show. Myerowitz added that the diagram was just an architectural drawing.

Ha declined to comment.