C15 I Can't Figure It out

Before I could get to the bottom of it, Jiang Ruochen took a light step to the left, blocking my view.

Just as I was in doubt, he suddenly spoke, "Go upstairs, be careful."

Since he was in a hurry, it meant there was something in the living room that I couldn't see. I kept my eyes away.

However, when my right foot stepped on the stairs, a familiar voice sounded in the air