Responses

Yes! I find their contrasting personalities especially endearing! HeTian seems like a prince-like character who's extremely playful, but deep inside he's actually soft hearted. GuanShan on the other hand, seems like he doesn't give a shit about anything but he has a lot of morals, is a major tsundere and gets flustered easily. I'd say they were a match made in heaven~ (▰˘◡˘▰)
There's a chinese saying called: 老夫老妻 which means old couple, it really suits JianZha (JianYi x ZhengXi) in my opinion, like they have been together for such a long time. I don't think there will be that much chummy scenes but rather playful ones that suit their personalities. Can you imagine them shyly kissing and going red? That's just out of character man... Also, they are pretty much in a relationship already, despite never really verbally acknowledging it. As for TianShan (HeTian x GuanShan) both of their personalities are very strong and their childhood stories are just beginning to unfold, how can you guys think they "appear too much"??
P.s: the extra is just something fun that OldXian drew to commemorate her sales hitting 30,000. It isn't an indication of the level of intimate moments. I'm not here to bash on any shipping, i just hope y'all can appreciate and support both pairings the same like i do!!! (●'◡'●)ノ