You may remember her from “The Real World: San Diego,” a hot Korean-American party girl with questionable taste in men. Now look at her. This weekend, Jamie Chung plays Heaven, a sword-wielding Japanese warrior in “Samurai Girl,” a three-night ABC Family miniseries based on the popular young-adult books. May be worth a look. ABC Family keeps coming up with entertaining shows (“Greek,” “Secret Life of the American Teenager,” “Middleman”), and EW gave SG a B+.