In 2002, NHN was registered in KOSDAQ and launched the online Q&A service, Naver Knowledge iN. In 2003, NHN merged all Japanese subsidiaries into NHN Japan. In 2005, Naver began the online donation service: Happy Bean. It also established its US branch under the name NHN USA. In 2007, it launched Naver Japan in order to pursue its search engine business in Japan. Meanwhile, NHN USA officially opened its American game service, ijji. However, it later sold away its 100% stake to Aeria Games.