How so? if its because shes short wouldnt you just be able to see her ears?
From how i see it, the joke is supposed to be how Wise doesn't have "the one" for him. (even tho its Zhu yuan:ReinSmile:)
I love Wise/Zhu! However, it might be because the artist on twit ships Wise with guys (I think lighter if I'm remembering correctly) and while they like the other MCs with some female characters they don't like Wise with them
Almost certain this is a Silent Hill reference, possibly a scene reference, but I'm not well acquainted with the franchise. Please feel to add appropriate tags if warranted.