"Earth to Crow!" David hits his forehead quite hard, waking him up from his previous revelation concerning Min Soo's involvement in Sanctus Luminera's doomsday. The peripheral vision of Min Soo in dark garments and fangs makes him look demonic rather than humane. There must be a reason why Min Soo suddenly becomes a half succubus.
Perhaps, an incubus since he's a male thus categorizing him as incubi would make sense. The meeting is still going, Crow waits for his brother to finish explaining his plan. It starts to make sense why Min Soo choose David as his lover. David King is a charismatic leader, looked up by others, and a powerful Explorer as well.
Unlike any silly main character stereotype, David is a realist and an entrepreneur in the heart. He will try to thrive no matter how he dislikes the situation he's in. Judging from David's characteristics, he will probably try his best to make Min Soo happy. He may look aloof, but he's quite the kind soul.