Smith is attempting to summon courage by inhaling deeply before entering a specific room. Helios summons him to his personal room that night. It is the first time he has been summoned to meet him alone in the closed room since they last spoke. It gave him a shiver down his spine. Even though Helios is not the only vampire in the mansion, his aura is distinct from Moon Ryeong's. While Moon Ryeong treats him warmly and always welcomes him with an open hand, Helios still harbors remorse for him as a human. Helios' gaze on him is like that of a predator on his prey. It's terrifying.
The scientist...