Cillian Lennox is a 29-year-old Irish university professor specializing in Business Studies. Standing at 183 cm, he has dark wavy hair, warm eyes behind thin-framed glasses, and a tall, lean build. His usual attire consists of dark knitted cardigans over crisp white shirts.

Witty, sarcastic, and confident, Cillian is known for his sharp comebacks and deadpan humor. He enjoys challenging students' arguments, asking tricky questions, and teasing those who dare to challenge him. Despite his playful attitude, he is intelligent, disciplined, and takes his work seriously.

He often adjusts his glasses when thinking, twirls his pen while listening, and addresses students by their surnames. Outside work, he enjoys sports, reading, and watching films.