Since Chen Lihua's focus was on her phone, hence, she didn't see her mother walking past her as her attention was on her phone.
So when she felt the sting on her forehead, she exclaimed in pain, "Ah!" before looking up to find the culprit, and which was her mother, who was already walking away, so she screamed in anger, "Mum!".
The only response she got back was a 'Shut up'. Before she could see her mother's back again, she had already disappeared from sight.
Seeing her fuming mad, Liu Longwei almost laughed out loud as he found her face very funny. He really had a heard time keeping his laughter in, as he didn't want to do anything that would trigger the time bomb.
Chen Lihua thought she hearf a muffled laughter coming from her side, and so she turned to look at Liu Longwei, only for her to see his face in a frown. She became confused and so began to wonder if she did hear well.