There is a saying, that a person's actions toward the others will one day come back to bite them and now as he meets the slightly similar situation that Shao Cheng has done after waking up from his high fever in the past, is unable to react one bit.
Ren Yuan words of asking of who he just keeps rining on his mind repeatedly, which is causing Shao Cheng mind to be in a brink of snapping because the entire time, he has never forgotten the fact that Ren Yuan doesn't remember their previous life interaction.
Shao Cheng has just buried it deep inside his heart that was once more was dig out as his heart twist in pain and misery at the thought of being disremembered once more and causing Shao Cheng to become unbalanced as dark thought keeps flashing on his mind.