Immer: always.
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The three guys stared at Zhou Yongliang in horror after the latter revealed an unexpected secret about Yang Liu. There were hints of disbelief and scared in their faces, and they didn't go unnoticed by Zhou Yongliang.
The three guys knew Yang Liu longer than him. Even when he had not transferred to Beijing, they had known Yang Liu even though only from the outside. Now they were shocked by Zhou Yongliang's revelation. Vampires were supernatural creatures that didn't dominate the world again, after all. Hearing the word vampire again was quite unbelievable.
Zhou Yongliang knew that he shouldn't have unveiled Yang Liu's secret in front of his friends, but he felt that he needed to be honest with his friends before he could ask for help from them. That was why he took the risk to tell the truth to his closest friends.