Tak Jung-Hwa keenly sensed it when Nurse Chen went still once he mentioned Xuanlong.
Ha… bingo.
To be completely honest, he had no idea whether Nurse Chen was really a former member of Xuanlong. He had no concrete evidence to back up his claims nor did he have even the slightest clue about it. All he had was his natural instinct and years of rich experience of dealing with vicious criminals.
However, he had learned not to show the slightest hint of weakness during interrogation. Asking questions to a criminal was akin to fighting without weapons, not only would he have to suppress the other party in terms of wits and intelligence, he also had to maintain the upper hand in terms of psychological fortitude.
If you want to force the truth out of someone's mouth, then you have to act as if you know everything.