It's a program that every Korean knows, but no one who isn't Korean knows. That's HWP. The official name of the program can only be written as ‘ᄒᆞᆫ글’.

Have you ever suddenly received an HWP file but were flustered because you didn't have Hancom Office? What if you need to check the content, convert it to PDF, PNG, TXT, etc., or even urgently edit it?