When does this scene happen?

That's a fan-made insert, it's not made by Old Xian. Scene happens right after they kissed.

THANK YOU FOR THAT GAHD BLESS YOUR SOUL

Really? I reviewed thoroughly (XD) the kiss scene, and the manga and I haven't seen the scenes where the person could've edited it like that. I thought for sure it was a raw chapter. huhuhuhuuh are you sure, it's just an fanmade? T_T

If it isn't fanmade it should be included in the chapters here. Also, the art style and coloring is different.

Huhuhu so sad, I saw that on Pinterest and it's what got me hooked to this manga. That fan is such a good editor, bless him/her. She did some good inserting skills cause I didn't see any of those scenes in the manga that I could remember XD

Oh I think you misunderstood, I used the word "insert" wrongly. That's more of a fanart, maybe you could think of it as a doujinshi if you're familiar of that term.