i want a manga or a one shot or about a character who lost hope about love/life/this kind of thing and because of the other character, he starts getting his hope back.
it may be kind hard to find but i really want to read this kind of stories

The recently picked up Red Beryl ni Sayonara sounds like it might be a good fit.

Ai Koso Subete (KINOSHITA Keiko) too, probably. Though they've both only lost hope in romance, not life.

Ai wa Chitto mo Rakuja by Kiriyu Kiyoi

https://www.mangaupdates.com/series.html?id=129739

thank you very much for your help
i will check both manga (i am already reading Red Berly)