LUO YAN continued his interview with Daphne. The other was very cooperative. Even though she acted unwilling, she still answered every question that he asked. In fact, out of everyone he'd interviewed so far, she was the most amiable. It solidified his guess that Daphne was one of the four (team mates).
From now on, he would refer to his team mates as that, 'the four'. That way, he could avoid the possibility of the game system acknowledging his guess. Since this game system could recognize whenever he made a right conclusion, as evidence of that notification sound, then it's also possible that it could consider his thoughts as valid indicator that he unmasked his team mates' identities. Which in turn would lead to the failure of their mission.