This Vampire story is so intriguing because of their unique conditions. In my understanding.. Sooin’s blood is actually poisonous to vampires. But it’s sweet to Chi-hwan instead because he had eaten vampire’s hearts. JooHyun wants Sungha to make Sooin his link in order to kill Chi-Hwan, so he also fed Sungha vampire’s hearts which none vampire want to eat that. So Sungha is quite right that he doesn't owe JooHyun, they're even as using each other.
This Vampire story is so intriguing because of their unique conditions.
In my understanding.. Sooin’s blood is actually poisonous to vampires. But it’s sweet to Chi-hwan instead because he had eaten vampire’s hearts.
JooHyun wants Sungha to make Sooin his link in order to kill Chi-Hwan, so he also fed Sungha vampire’s hearts which none vampire want to eat that. So Sungha is quite right that he doesn't owe JooHyun, they're even as using each other.