It was Sungwoon who heal Taesun's hand when he got burn from the stove. We never see Wolhyun's power. Now he is sick like a normal child. Besides, demigod always be portrayed as beings lack of emotions like Geumryeong. Sungwoon looks 'calm', but he didn't show much emotions like Wolhyun did. Is this indicates one of them human? But they both can turn into snake. Maybe one isn't just as strong.
It was Sungwoon who heal Taesun's hand when he got burn from the stove. We never see Wolhyun's power. Now he is sick like a normal child. Besides, demigod always be portrayed as beings lack of emotions like Geumryeong. Sungwoon looks 'calm', but he didn't show much emotions like Wolhyun did. Is this indicates one of them human?
But they both can turn into snake. Maybe one isn't just as strong.