Samsung Securities(삼성증권) is a Korean securities company, owned by Samsung Group.
This company is the most foreigner-friendly stock investment and trading company in Korea. They offer their (almost) full trading system in English. To connect to their english website, click here
In 6th April 2018, This company made a serious blunder that mistakenly issued 2.8 billion shares to employees, which theoretically worth over $100 billion and some of them were sold off by workers. As a result, this company got fined 144 million KRW (about 130k USD) and partial suspension of their business by the Financial Services Commission. Because of that, New customers can't trade stocks and shares in this company until 27th January 2019.