The Fox has a 'stomach bug'

Since Chu Yun was up, it was only right they returned to their estate and stopped imposing on Tan Ruo and Minister Song's hospitality. 

Tan Ruo was of course curious about the physician's diagnosis, even more so when Chu Yun paled at the mere mention of it.

"Ah, nothing to worry about, just a stomach bug," Xiao Zai said, which earned him a glare from Chu Yun.

A 'stomach bug' really?

They were almost at the estate's gates when Chu Hean rushed outside. He came to a sudden stop as soon as his eyes met Chu Yun's.

"You're alright?" he asked, glancing up and down Chu Yun's form, searching for any obvious signs of illness.

Chu Yun only nodded stiffly and climbed into the carriage. He didn't have anything else to say to Chu Hean, not after their last disastrous conversation. He couldn't understand why Chu Hean would want to humiliate himself by becoming a concubine.