SEOUL— Chey Tae -won, the billionaire atop blockbuster memory chip maker SK Hynix, announced the breakup of his fairy tale marriage to the daughter of a past president in a three-page letter to a South Korean newspaper a decade ago. In the letter, Chey acknowledged he loved another woman and had a child with her. In court papers cited by local media, he said he didn’t believe his 27-year marriage could be saved and quoted the opening of Leo Tolstoy’s novel “Anna Karenina,” a tragedy that plots its own love triangle: “Happy families are all alike; every unhappy family is unhappy…

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