Seoul, South Korea, May 27, 2025 (GLOBE NEWSWIRE) -- GRAVITY Co., Ltd. (NasdaqGM: GRVY) ("Gravity" or "Company"), a developer and publisher of online and mobile games, announced that 仙境传说之 约 定 好 的 冒 险 (Ragnarok: Promised Adventure, tentative English title), an adventure MMORPG game, received an ISBN code by Chinese government disclosed on May 21, 2025. Ragnarok: Promised Adventure marks the second ISBN in 2025 following 仙境传 说 ： 初 心 (PROJECT ABYSS, tentative English title) in January. Ragnarok: Promised Adve ...