Embraced at both the Pusan and Sundance film festivals, poetic Korean documentary “Old Partner” captures the uncommon love story between feeble old farmer Choi and his trusty ox, a bond by which the two stubborn but mutually respectful parties have sustained one another for nearly 40 years. Universally appealing in its simplicity, pic follows the pair through their last year together, during which both seem weary enough to keel over at any time. Not since Robert Bresson’s Balthazar has a beast of burden been so tenderly portrayed on film, making for a modest, memorable arthouse release with great word-of-mouth potential.[...]