Now I'm wondering who were the top or botton back then.

Correct me if I’m wrong, but aren’t the “roles” still the same? The one with gold eyes in the past is the current MC right now, while the Goblin King has gold eyes now, but he used to go by Soha, who previously had blueish eyes.

So either way, the MC looks like the bottom, now and in the past too.

Chapter 22 doesn't leave much to wonder. Soha is literally trying to screw Hwee-un.