It’s not just the way the Seowoo looks, it’s the way he acts. He acts very childlike, in spite being an adult. So that, on top of his appearance, is really uncomfortable.
The size difference is similar in Sign, but Soohwa clearly acts like an adult, an immature one, but an adult nonetheless. And it doesn’t feel like there’s a difference in maturity between Yohan and Soohwa, unlike with Seowoo and Reaper.
So I don’t think the comments are wrong to feel weird about this.
It’s not just the way the Seowoo looks, it’s the way he acts. He acts very childlike, in spite being an adult. So that, on top of his appearance, is really uncomfortable.
The size difference is similar in Sign, but Soohwa clearly acts like an adult, an immature one, but an adult nonetheless. And it doesn’t feel like there’s a difference in maturity between Yohan and Soohwa, unlike with Seowoo and Reaper.
So I don’t think the comments are wrong to feel weird about this.