What is the biggest Korean company?

Could you please explain to me, in your own words, what the largest Korean company currently is? I'm quite interested in learning more about the financial standings and the influence this particular business entity holds within the Korean economy. Also, if possible, could you provide some insight into what makes this company so successful and how it manages to maintain its leading position in the market? I'm eager to understand the key factors behind its growth and sustainability. Thank you for your time and assistance in this matter.