Think of this as when you read a main story, it’s finished now you have the side couple, which literally is the situation right now because at the start you don’t see momo and jian like you would see the first couple. Think of it as reading the second half of the story - like a “Afterwords”
that opinion is wrong from the beginning bc their story is still unfinished, it still needs progression and time. and personally i don't think that's the case. i don't remember the chapters but for a while the author tried to show both couples and give them equal spaces but them they give up on that and i still don't understand why they do that. and after that all we read was he tian and little mo and it's still like that. i just wanna see the other couple but unfortunately they're not avaliable right now. it hurts.
i started to read 19 days so long time ago, after reading it like 100 chapters it became my comfort webtoon. i laughed, i cried, i felt everything with them and fall in love with this four guy. but lately all i see is two of them, he tian and little mo. the story is mostly about them and there isn't much development between jian yi and zheng zheng. i wanted to see their relationship too, but couldn't. like i said, i love all of them and naturally i want to see all of them, not just he tian and little mo but jian yi and zheng zheng too. i hope we will get some scenes of them too.