The writer Young-Ha Kim burst onto the South Korean literary scene with "I Have the Right to Destroy Myself," a novel available in English about a sophisticated young man who helps other people commit suicide. It became an international sensation, and since then Kim has published a series of prize-winning books that neatly mesh high and low culture.

His thriller, "Your Republic Is Calling You," has just been released in a new translation by Chi-Young Kim and our critic-at-large, John Powers, says it offers a gripping look inside a culture that's moving at a dizzying pace.

JOHN POWERS: When I was growing up, there was no more famous symbol of the Cold War than the Berlin Wall. But in fact, the Wall could never really compare to the demilitarized zone that divides North and South Korea. Still going strong after 57 years, it has created a parallel reality worthy of Philip K. Dick.

By now, most people know that North Korea may be the strangest country on Earth - an Orwellian dystopia complete with starving citizens, nuclear weapons, a goofball dictator, and public displays seemingly choreographed by Busby Berkeley. But in the West, it's less well-known that South Korea is a booming modern democracy with an infrastructure more advanced than our own. It's also an outward-looking cultural player. Even as South Korea's TV soaps dominate Asia, it also boasts one of the world's most exciting movie cultures - it had five films at Cannes last May.

From the outside, the split between the Koreas is usually seen in terms of geopolitical menace. But from the inside, it's lived as a bizarre form of identity crisis. This is precisely the subject of "Your Republic Is Calling You," a smart new literary thriller by Young-Ha Kim, who at 41 is one of South Korea's best and most worldly writers, with a knack for Kafkaesque surrealism and irony.

Taking place over a single day, the novel tells the story of Ki-yong, who seems to be an ordinary, middle-class guy in his 40s. He imports foreign films, has an attractive wife, Ma-ri, who sells VWs, and a brainy daughter who is just discovering boys. But Ki-yong has a secret: He's a North Korean spy who has been sleeping with the enemy for the last two decades. And on this day, he gets a chilling message from his masters back in Pyongyang. He has 24 hours to liquidate everything and return home.�Terrified, Ki-yong doesn't know whether he's been found out by the South Korean authorities or whether the North is calling him back to liquidate him.

Unsure whether to go back, Ki-yong spends the day wandering around Seoul and remembering his time there, basking in what he calls premature nostalgia for the city he may be leaving. He doesn't have a clue that his wife Ma-ri also has secrets - she's trying to decide whether to partake in a threesome with her young lover.

Fueled by paranoia, "Your Republic Is Calling You" pulls you along like a thriller, yet Kim is after more than suspense. A keenly observant writer, he turns his story into an amusingly bleak X-ray of present-day Korea, whose people are as interested in Bart Simpson as Kim Jong Il. Along the way, we meet a huge array of sharply drawn social types - comedians and tax cheats, porn addicts and schoolteachers, spoiled college kids and former student radicals like Ma-ri, who find their generational dreams of national reunification curdling into desperate adulteries. She wonders how it all went wrong.

Nobody is more lost than Ki-yong, who we see living in three different countries. He spends his first 21 years in North Korea being force-fed ideology, eventually training to be a spy in a crazy underground simulacrum of Seoul. The second country is '80s South Korea, starting to prosper but not yet democratic - it was exploding with protests like the American '60s. The third country is today's go-go South Korea, devoured by a run-amok selfishness and materialism that Ki-yong both enjoys and holds in contempt. Adapting to these very different realities, Ki-yong feels less like a spy than a cyborg, one programmed to adopt whatever self the society of the moment demands.

He feels trapped, and so do those around him. Although South Korea is wealthier and freer than ever before, the novel suggests that the country's apparent freedom is far from liberating. Like the Berglund family in Jonathan Franzen's new novel, its characters wind up buffeted by confusion and regret, boundless yearning and fierce isolation.

It would spoil things to say what Ki-yong winds up doing, but suffice it to say that by the end he and Ma-ri have gained a cruel wisdom. They discover that the choices they think they're making freely aren't really free after all. In fact, they are hostage to forces - personal, historical and existential - that they can't control and don't fully understand. They're adrift. Children of a fractured republic, they forever hear something calling them back home, but they no longer know where home is.

DAVIES: John Powers is film critic for Vogue and Vogue.com. He reviewed "Your Republic Is Calling You," by Young-Ha Kim.

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