The voluptuous sister being chased and beaten by Feng Xue was extremely frustrated at the moment. Never mind that each room in the Tower of Babylon could open at least once a year, but the timing and location of its opening were completely uncontrollable; it wasn't unheard of for it to open on the last day of the challenge month due to bad luck.
He was somewhat fortunate this time, as he had pushed open the door to the Otherworld early in the year, and the differing calendars of the two worlds meant he hadn't realized the challenge month had arrived.
Or rather, even if he realized it, he wouldn't return immediately, because the doors of the Tower of Babylon and those opened by outsiders could only be used once per person. So even if he knew the challenge month had come, he'd wait until the challenge rules were triggered before returning—
But at the very least, he wouldn't be having tea in this month!