Writing down the value of Tesco's property portfolio accounted for about £4.7bn of its record annual loss.
In July 2014 Tesco appointed Mr Lewis as chief executive to replace Philip Clarke and he started in October.
Before he took over, the retailer said in September that it had mis-stated profits by £250m - a figure that was raised to £263m a month later.
After an initial rise, shares in Tesco were down 0.4% in afternoon trading at 185.25p, valuing the company at just over £15bn. The stock has fallen almost 18% in the past 12 months.
Homeplus has 140 hypermarkets, 375 supermarkets and 327 convenience stores.
The BBC's Seoul correspondent Stephen Evans says it has been very successful and shaken up shopping in South Korea, providing local goods as well as some Tesco staples such as its own range of wine and tea.
The MBK Partners consortium said it planned to invest 1 trillion won (£546m) in Homeplus over the next two years to increase its competitiveness.