Why was he here?

Xiao Hua stared at Yu Dong and Gu Ke Jin for a very long time, at least until Yu Dong walked inside her office and only then did he get up from his chair and said to Gu Ke Jin, " Aren't you sticking a little too much to Yu Dong?" He never thought that he will feel this upset over another woman approaching Yu Dong but apparently, he did and he did not just feel upset, he felt raging upset. Like the one where he wanted to stomp on Gu Ke Jin like she was a door mat. 

" What do you mean by that?" said Gu Ke Jin as she raised her head from the account books that she has just shown to Yu Dong and narrowed her eyes at Xiao Hua. " And it will be better if you don't speak to me at the moment, you were the one who said that you wanted to have an affair with me and you were also the one who dragged me along trying to kiss me but when Miss Dong asked what was going on you were the first one to run away with your tail stuck between your legs, do you  take me as your toy?"