The fifth biggest firm in South Korea gets an estimated 30% of its sales from China, and employs about 20,000 people there.
But in the past week, several of its businesses have faced a backlash from hackers, customers and Chinese partners.
On Monday, Lotte said that more than 10 of its department stores across the country had been closed down suddenly. So what's going on?
Background: Missiles and a golf course