By the Neva River.
The sky was pitch-black, while the room was brightly lit. The drafts covering the floor glowed white.
A fair-skinned girl lay sprawled amid the piles of paper, her long brown hair cascading smoothly down her back. She was as beautiful as an oil painting.
Katerina rapidly filled several sheets of paper, but they were full of loopholes. Frustrated, she crumpled them into balls and threw them into the corner of the room.
Dozens of paper balls had piled up in the corner, like a group of small animals huddling together for warmth. Each one recorded failure and frustrated embarrassment.
"Primakov, you're so unreliable!"
Katerina cursed angrily, grabbed her phone, and began typing furiously.
"Stop pretending to be dead. I know you're awake. Have you made any progress or not?"
A moment later, a reply came.
Xie Kefu: "I have two full pages of proof in my hands. I've made a huge amount of progress, and I've checked the calculations. They're correct."
Katerina raised her delicate eyebrows in pleasant surprise. Two full pages of proof?
It seemed she had underestimated Xie Kefu. Was he actually quite capable?
Xie Kefu: "But I can't send it to you right now."
Katerina frowned. "Why?"
Xie Kefu: "The proof isn't mine. It's Song He's."
Seeing the name on her phone screen, the girl lying among the piles of paper froze in astonishment and couldn't help sitting up.
Her first reaction was, Song He is actually that formidable? He proved two pages in just one day? His abilities can't be underestimated!
Then she grew angry again, her fingers tapping sharply against the screen.
Katerina: "You let him join in. You should have told me beforehand, at the very least! We had to discuss how to divide the work and cooperate, and decide