1. Toggle to Korean keyboard.
2. Click “Han/Eng Toggle” (A/가) to choose Hangul (가).
3. Click “Soft Keyboard” and type a syllable in hangul.
4. Click “Hanja Convert” (漢) or press the right Ctrl and some choices will show up.
5. Choose the correct Hanja.
From the video, you can see Korean Hanja and Japanese Kanji for the word with the same meaning (company/corporation, “kaisha” in Japanese, and “hoesa” in Korean) are slightly different.