Hi!
I'm looking for a manga, but I'm not sure about the genre. It could be shounen ai. It was about a really tall high school boy who couldn't stop growing and needed surgery in a foreign country in order to put his height to a halt. In school he met a really short boy, who had a different disorder and stopped growing early. They became friends because they could understand each other's hardships.
I remember the author had other stories in the same universe, where a pair of siblings was introduced - a girl and a boy, they escaped from somewhere and managed to start living alone. By some turn of events they became roommates with the tall and the short boys after they graduated high school. I think the sister hated kids, however she helped a child once. In my memory the art is really good. I've been trying to find the title by googling key words but NOTHING comes up. It almost makes me question my own sanity, you are my last resort 😁

Collection of short stories by Zen
Tall and short boy: Summer eyes
Siblings’ story: In Autumn's Last Rain, On The Right Shoulder
Them living together: Housemates
The works are originally Vietnamese.

Aaaaah! Thank you so much!