Question: Where is the company head quarters that makes the GU230 mobile phone?

full_context: Document 1: LG Corporation: LG Corporation (Korean: 주식회사 LG), formerly Lucky-GoldStar (Korean: "Leogki Geumseong" (럭키금성/樂喜金星), is a South Korean multinational conglomerate corporation. It is the fourth-largest chaebol in South Korea. It is headquartered in the LG Twin Towers building in Yeouido-dong, Yeongdeungpo-gu, Seoul. LG makes electronics, chemicals, and telecom products and operates subsidiaries such as LG Electronics, Zenith, LG Display, LG Uplus and LG Chem in over 80 countries.
Document 2: Samsung Electronics: Samsung Electronics Co., Ltd. (Korean: 삼성전자; Hanja: 三星電子 (Literally "tristar electronics")) is a South Korean multinational electronics company headquartered in Suwon, South Korea. Through extremely complicated ownership structure with some circular ownership, it is the flagship company of the Samsung Group, accounting for 70% of the group's revenue in 2012. It is the world's second largest information technology company by revenue after Apple. Samsung Electronics has assembly plants and sales networks in 80 countries and employs around 370,000 people. Since 2012, Kwon Oh-hyun has served as the company's CEO.
Document 3: Hyundai Motor Group: The Hyundai Motor Group (] ; Hangul: 현대자동차그룹 "Hyeondae Jadongcha Geurup" ; Hanja: 現代自動車그룹 "Hyeondae Jadong-cha Geurup" ) (stylized as HYUNDAI) is a South Korean multinational conglomerate headquartered in Seoul, South Korea. It is the largest vehicle manufacturer in South Korea and as of 2015 the world's fourth largest vehicle manufacturer behind Japanese Toyota, German Volkswagen Group and American General Motors. The group was formed through the purchase of 51% of South Korea's second-largest car company, Kia Motors, by Hyundai Motor Company in 1998. As of December 31, 2013, Hyundai owns 33.88% of Kia Motors.
Document 4: LG Black Label Series: Black Label Series is a feature phone series created by LG Electronics.
Document 5: GU230: The "GU230" is a mobile phone manufactured by LG Electronics. The phone is designed to be low cost, and provide the essentials.
Document 6: Tongil Industries Company: The Tongil Industries Company Co., Ltd., (in short the “TIC”), is a South Korean heavy industry company headquartered in Changwon City, South Korea. TIC was founded in July, 1988 originally as the Jin Heung Machinery Co., Ltd. As of 2011, it comprises 4 business divisions; Machine tools, Ball Screws, Automobile Components and Heat Treatment. The Tongil Industries is a subsidiary of the TONGIL Group, a South Korean business conglomerate (chaebol) managed by Kook Jin “Justin” Moon, a U.S. citizen with a Korean ethnical background, who currently serves as Chairman of the group. The Tongil Industries currently have 3 locations; Korean headquarters, TIC-Europe (subsidiary in EU zone), and a US agent office.
Document 7: LG Secret (KF750): The LG Secret (a.k.a. LG KF750) is a 3G slider-style mobile phone manufactured by LG Electronics. It is the third phone in LG's "Black Label Series", following the "LG Chocolate" and "LG Shine". It was released on May 3, 2008 in Europe.
Document 8: LG Electronics: LG Electronics Inc. ("Lucky Goldstar") (Korean: LG전자 ) is a South Korean multinational electronics company headquartered in Yeouido-dong, Seoul, South Korea, and is part of the LG Group, employing 82,000 people working in 119 local subsidiaries worldwide. With 2014 global sales of USD 55.91 billion (KRW 59.04 trillion), LG comprises four business units: Home Entertainment, Mobile Communications, Home Appliance & Air Solution, and Vehicle Components, with Starion India as its main production vendor for refrigeration and washing machines in the Indian sub-continent. The CEO of LG Electronics is Bon-joon Koo, who assumed the role of vice chairman of LG Electronics on 1 October 2010.
Document 9: LG Chocolate (KG800): LG KG800 is the European version of the LG Chocolate, the first product of LG Black Label Series. It is a GSM Tri-Band mobile phone manufactured and sold by LG Electronics. It was released in May 2006 and had its marketing strategy planned and executed by John D. Bernard, a marketer based in the UK. The KG800 is a 'slider' style phone that reveals heat-sensitive touch buttons on its face, which activate upon sliding the phone open. A slightly modified version, released as the LG TG800, was sold by Rogers Wireless (discontinued) and Fido in Canada. Additionally, Bell Mobility has a modified version of this phone that works on their CDMA/3G EVDO network despite the offering of the LG Chocolate (VX8500) in Canada available there through Telus Mobility.
Document 10: LG Rumor 2: The LG Rumor 2 and LG Script (LG Rumeur2 in the province of Quebec, and LG Rumour2 in the rest of Canada ) is a Sprint, Bell Mobility, Solo Mobile, Virgin Mobile USA and Virgin Mobile Canada feature phone manufactured by LG Electronics. It is available in black titanium, vibrant blue, purple, gray, and orange. The phones are offered by Sprint in Black, Blue, and Orange and were released in March 2009. The regular price of the phone is $249.99.
Document 11: LG Shine: The LG Shine (a.k.a. SV420, KE970, KG970,KU970, LG ME970, LG CU720, LG TU720, or LG KG70) is a slider-style mobile phone manufactured by LG Electronics, the second installment of LG Black Label Series, followed by LG Secret in 2008. Originally marketed in Asia as the LG Cyon SV420, LG expanded the phone to other markets including Europe, South America, and parts of North America. The LG Shine is similar to the LG Incite.
Document 12: Samsung: Samsung Group (Hangul:  ; Hanja:  ; ] ) is a South Korean multinational conglomerate headquartered in Samsung Town, Seoul. It comprises numerous affiliated businesses, most of them united under the "Samsung" brand, and is the largest South Korean "chaebol" (business conglomerate).
Document 13: Hyundai Motor Company: The Hyundai Motor Company (Hangul: 현대자동차 ; Hanja: 現代自動車 ; RR: "Hyeondae Jadongcha "   ; Hangul: 현대 ; Hanja: 現代 ; MR: "Hyŏndae " , ] , "modernity"; ) is a South Korean multinational automotive manufacturer headquartered in Seoul, South Korea. The company was founded in 1967 and, along with its 32.8% owned subsidiary, Kia Motors, and its 100% owned luxury subsidiary Genesis Motors which together comprise the Hyundai Motor Group. It is the third largest vehicle manufacturer in the world.
Document 14: LG Chocolate Platinum (KE800): The LG Chocolate KE800 is an update of the LG Chocolate KG800. The phone also is part of the Black Label Series II line of phones. The phone is marketed as a fashion phone, and newly contains a music player, a Micro SD memory card slot, as well as an FM radio.
Document 15: Lee Jae-yong (businessman): Lee Jae-yong (이재용 ; born 23 June 1968), known professionally in the West as Jay Y. Lee, is a South Korean business magnate and the vice chairman of Samsung Group, serving as de facto head. He is the eldest child and only son of Lee Kun-hee, Chairman of Samsung, and is widely considered to be his father's future successor. He is referred to as the "Crown Prince of Samsung" by the South Korean media, and speaks Korean, English and Japanese. Lee is estimated to be worth US$7.9 billion, making him the third wealthiest person in South Korea.
ground_truth: Yeouido-dong, Seoul, South Korea,