"But... sigh, how to put it, there's still regret."
He turned his head and looked at the [Arithmetic Sequence] written on the blackboard, above which were the names of the girls who had been in this laboratory, arranged sequentially by age difference—
Yan Qiaoqiao, (blank), Chu Anqing, Su Su, Zhao Yingjun, Huang Que.
"The arithmetic sequence is not yet complete."
Liu Feng said regretfully.
For a moment, Lin Xian didn't know whether to laugh or cry:
"You're still hung up on your arithmetic sequence, I really didn't expect this to become your regret."
Liu Feng walked to the blackboard and pointed at the space between the names of Yan Qiaoqiao and Chu Anqing:
"There should be a 17-year-old girl here, but... for so long, no girl of this age has ever come to the laboratory."
"It seems this time, the arithmetic sequence is truly going to be a regret."
He closed his eyes.
His five fingers spread open, pressing against the blackboard:
