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The two met in the summer of 2015 and also appeared as a couple on JTBC's 'With You 2: The Greatest Love', showing off a real-life couple's day to day relationship. However, due to Guillaume's busy schedules in Korea while Song Min Seo was away with her own busy schedules in China, the two simply decided to remain close friends, according to Guillaume's agency.
Guillaume Patry is currently active on shows such as JTBC's 'Abnormal Summit' as a panelist representing Canada.
Best of luck to both in the future!