Dr. Yuri "saved" the prince before so maybe when the prince was young he became a test subject to this crazy doctor, i remember the prince talked about experiments to Gem. The prince body mustve been quite special that the crazy doctor was doing experiments. Also, Yuri banned the prince from drinking others medicine (cuz you know, test subject). I'm just really curious how things will turn out, I'm still waiting for the love fairy's other half.