C1477 Second Young Book Suicide?
The meaning behind his words was that he was single, but the two of them were "female companions" and not "girlfriends". This way, neither of their identities would be restricted to awkward situations because of the other.
The reason why Wu Xueran made this request was because he had his own selfish motives. She would be going back in half a year, and as long as she wasn't his trump card
