In the 'Roh Gil Series' , we meet with domestic and foreign game developers who walk out of the way only based on their philosophy, without being in a rapidly changing situation and external environment. This time, it is divided into sub-classifications of Dong-in games and highlights the indie industry in Japan, which is relatively low in recognition. The fifth developer is the indie game developer 'HAP Inc.', which received great attention in the domestic mobile industry as a casual adventure game 'Mom hid the game' series. Hep is a single game developer who makes everything alone, from illustrations to planning and programs. In the meantime, about 20 games have been released, and the number of apps of the app has already surpassed 100 million. I heard about where his know-how, which has been able to continue the development of indie games for more than 10 years, is the story of a one-person developer Ishimoto Yusaku, a representative of Hep. ■ 'HAP...