C58 We Are Enemies

I couldn't think of a reason.

At this moment, the doorbell rang. I rubbed my aching head and reluctantly moved to the door, complaining as I opened it. Won't you come through the wall without a key? What do you want to ring the doorbell for? "

I thought Gu Chen had returned, but who would've thought that there would be a slightly familiar looking man in his early twenties standing at the door