Koala Reads

"On the way back to the Pingyang Marquis Mansion, Su Qingyu's smile vanished completely, replaced by a thoughtful look."

"The so - called "When the number is odd, the function changes; when it's even, it stays the same. The sign is determined by the quadrant" was an extremely well - known mathematical formula in their era. It was so famous that it had replaced the phrase "The heavenly king covers the earth tiger; the pagoda suppresses the river demon" as the secret signal for time - travelers to identify each other."

"The fact that the young girl from the Yongguo Duke's Mansion could answer the next line indicated that she, like Su Qingyu, came from the future and was part of the "time - traveling" army."

"This girl was luckier than her. She was born into a duke's mansion, starting at a much higher level."