When Zhao Qingge made an unexpected visit, Li Peifeng's first reaction was terror mixed with anxiety because there was also He Yimeng in the room. Old Zhao already had suspicions about the relationship between these two, and now if she enters the room and finds him sharing a room deep in the night with this white-haired girl, no matter how he tries to explain, he can't turn white into black; the consequences would be unimaginable.
Even if they're fully dressed now and seem to just be 'discussing the script,' it's not feasible. Say what you will, no man and woman stay alone in a room late at night to discuss script matters without raising suspicions; even a child would see through it instantly. So if Old Zhao were to witness this scene, her attitude towards Li Peifeng would surely worsen, possibly to the point of giving up entirely, and her knowing this means the other three girls would know too.
