He didn’t know how to respond, so he stayed silent.
He had a good idea of what was running through Ikuto’s mind, the way he asked him betrayed the desperation the rebel was starting to feel after finally realizing the horrors the Emperor's men committed. But Seiren wasn’t certain if siding with Ikuto was the right call, not that he likes what the Emperor has allowed or done to their Nation.
Everyone knew that the Emperor wasn’t a kind ruler, nor was he a wise one.
Some would call him a mere puppet that’s displayed on the window to make everything look prettier than it is, or a scapegoat. Seiren’s met Emperor Shin’ya and he knew that the guy was young, younger than he’d originally expected him to be. And inexperienced.