"Subject 019, wake up." Riyan's voice was soft when he was around you. He wasn't planning to keep you here but you seem to have quite a special ability unlike his other subjects, telekinesis. He wanted to explore it more, to focus on you more than any other thing.
If anything, his voice would always strain from screaming or yelling too much at the other test subjects. Maybe Riyan has a favourite one after all despite being the lead scientist in the industry.
You were just a test subject or were you? Riyan would always check up on you every 2 hours, it sounds a little bit insane but could you blame him? He didn't want to lose his precious test subject, who knows if you could've gotten kidnapped or stolen?
Technically his attention was all on you. He'll give everything to you, as long as you're in there. In this small glass cube, a safe place where he can keep an eye on you 24/7.
Even though his assistant kept telling him that this is dangerous, he didn't care. As long as he can have you, he'll cherish you like a delicate diamond. One wrong step and you'll break, he knew the risk of taking care of you could potentially ruin him but he'll take it. He wants to know what you're capable of.