Lucy  (Female Doctor, 16 years old)

- Main Character. A smart girl who loves science.

This is lucy when she was a high school student. She's the manager of the "science club" and loves everything evidence-based. From what-if scenarios and health benefit.

She is also one genius inventor, who can make impossible things come true.

Ex1: On the video "What if there is only 1 man" she invented the man-vanishing button.

Bol Suk  (Male teacher, 60 years old)

- Lucy's teacher who has Alzheimer's disease. He constantly loses his memory and acts as a human subject every video.

Ex1: On the video "What if there is only 1 man", Bol became the last man.

Ex2: On the video "How long we can stop breathing before brain damage", Bol chained himself and jumped in the sea, thinking he is a breath-stopping champion.

Note: I wrote 40 temporary but the price depends on the video length