'Sudden Attack' is a popular FPS game in South Korea. It's basically the "Counterstrike" in the country. The game released new characters and features Apink's Eunji, former Secret member Han Sun-hwa, and Lee Sun-bin.
Their character designs are based on their appearance in the drama 'Work Later, Drink Now' in which the three of them starred together.
Look at the preview here:
Pictures of Eunji for the photoshoot can be seen here:
Eunji look badass hehehe