Its ambiguously portrayed but juanyi wasnt friend zoned. In fact, i reckon that they are together after the timeskip. During jianyi’s confession, xixi didn’t explicitly say acceptance, but more like declared that he will still continue being by jianyi’s side no matter what happens, and that he is open to the possibility, in a roundabout way. That is why xixi accepted every advances of jianyi and actually reciprocated in most cases. He knows, in some level, there is a seedling the he felt the same way. Altho he is still annoyed cos hes always dragged by jianyi
There’s censoring in China on gay media so even if the author wanted to make it official they wouldn’t be able to because of the ban but I think it’s up to interpretation or maybe hinting to them being romantically involved ?? Honestly I’m not sure
I wonder of Jian and Xixi will ever become a couple or if Jian was forever friend-zoned. Also I would love to get to know Xixi better after all those years. I feel like all I know is that he has a sister, they live with grandma and he likes gaming, that's literally it - all information about I'm after ONE DECADE.