Wattpad, the 14-year-old, Toronto-based, venture-backed storytelling platform with reach into a number of verticals, is being acquired by Naver, the South Korean conglomerate, in a $600 million cash-and-stock deal. Naver plans to incorporate at least part of the business into another of its holdings, the publishing platform Webtoon, which Naver launched in 2004, brought to the U.S.