Can I solve a case just by listening to the clues?

Detective Lee Kang-wool, who writes mystery during the day and novels at night. Then a female college student came to him.
Called a master of chemical engineering, she asks to find out who killed her beloved junior.
The suspects she brought in, however, reveal that there is another suspect.

Don't think complicatedly. Tell the truth in ten clues!
Yujin Games' first mini-project-roasting report begins!

Genre: mystery game
Playtime: 30 minutes~
How to proceed: Select and answer 10 questions to the suspects, then uncover the truth through subsequent reasoning.
Difficulty in reasoning: ☆☆☆☆★ (Bottom)