do koreans pour soju into soup like in k-dramas?

It's true that soju is often shown being poured into various dishes in Korean dramas, but, I think it's not a common practice to pour soju into soup. While soju is frequently consumed alongside meals especially  to a specific dish like soft tofu stew, it's generally enjoyed as a separate beverage, often in shot glasses, and not as an ingredient in the soup itself. Soju is a drink, not a cooking ingredient.