Chatting in the dormitory at night, roommates wonder how much pain Aunt Flow brings. Mr. Perfect He Zhi Zhou has never bothered joining in on these petty talks for amusement. That is, until he became a woman and laid in bed with a white-cast complexion… Chatting in the female dormitory at night, roommates sighed over the current pairings in the school of engineering, Shen Xi was a little curious that the problem with these topics is that there was no way to test them. Until she became a male engineering student and a bar of soap dropped in front of her…