OMG IS THIS CANON??? (≧∇≦)ノ
Yep, it was never said in the novel from which point Lu Feng started to have feelings for An Zhe, but as time went by he started to tease him/bully him more and more. (≧∀≦)
And even long after they became official he was still a huge bully ε=ε=(ノ≧∇≦)ノ
That makes me so giddy!! (≧∀≦) I'm sure from the time they met at that bar place where An Zhe worked, Lu Feng began to feel a spark within him! ლ(´ڡ`ლ)
AND THATS LADIES AND GENTLEMEN is the moment Lu Feng found out that bullying An Zhe is so entertaining that he's going to do it for the rest of his life ε=ε=(ノ≧∇≦)ノ