The dark secret had a strong connection to Oscar's past. According to Lisa, whether Oscar knew it or not, she'd better try to tell the man now. If Oscar didn't tell her anything, Lisa would assume the man didn't know anything about the dark secret.
Hearing her words made Oscar a little worried. The woman had never started a conversation in such a serious tone. Oscar knew that by the time Lisa spoke to him in a serious tone, it would not end well. She was bound to throw a big bomb that would make him shocked.
Oscar averted his gaze, unable to look at Lisa's eyes which gave off an aura of confusion. If there were a word that could describe his feeling better than 'nervous', maybe Oscar would use it.
Lisa looked at Oscar's side face and thought, did she take the wrong path? Even though she hadn't said anything, the man's face was already sad and panicked. She hadn't even said anything but her heart already ached, as if it was being stabbed by a thousand pins.