Lotte has its hands in a lot of things. At its heart a chocolate company, Lotte also has a chain of fast food restaurants in Korea and Japan and the most popular amusement park in Korea, called Lotte World. They own two baseball teams as well: the Giants in KBO and Marines in NPB. And I'm sure there's even more I've forgotten or just don't know about.
For collectors, Lotte is responsible for Bikkuriman, a very popular run of square-shaped stickers packaged with wafer candies.
From 2006 to 2008, they played around with baseball stickers. In 2006, those came in two forms. One was a Bikkuriman set, featuring baseball players in Bikkuriman-style art. The other was a traditional card-sized sheet of stickers.
The Bikkuriman stickers would continue for three years, while the card-sized sticker sheets only lasted two years. Bikkuriman promotions occur occasionally still, but no full set has been issued since 2008.
I'm certainly happy to cross this off my want list!