C439 (3)

Shaang Lu finally realized something. After all this time, he had learned that Bai Yun experienced her monthly cycle, lasting about six or seven days, around the same time each month. Calculating the days, Bai Yun's cycle was still about ten days away. He had been so worried earlier that he forgot to think it through.

Shaang Lu understood that Bai Yun was likely concerned about his health