This is The Last Time Keira!
Feng Xinying remembered all the lipstick stains on his thighs in the evening after they had woken up and he remembered how they had slept in her bed. While Feng Xinying became red with embarrassment, he smiled devilishly at her. She got up and rushed out of his room.
What had happened last night? She was trying hard to think about it, but couldn't recollect.
After dinner both of them couldn't sleep. Xie Yuansheng had switched off his laptop and paced his room up and down while Feng Xinying was trying to think of ways to meet him or bump into him somehow. Xie Yuansheng must have gone to the connecting door number of times to knock it or open it, but every time he would go there, he would curl up his hand into a fist and not knock. He thought that she had forgotten about him. He could hear some noise coming from the room and had wanted to barge in.