Something similar to Foul's Start is alright too
Try these
https://www.mangago.zone/read-manga/healing_elegy/
https://www.mangago.zone/read-manga/houyou_jikken/
https://www.mangago.zone/read-manga/does_spring_come_for_a_terminally_ill_esper_promo/
https://www.mangago.zone/read-manga/angel_buddy/
https://www.mangago.zone/read-manga/the_only_one_who_didn_t_know/
https://www.mangago.zone/read-manga/lips/
https://www.mangago.zone/read-manga/toxin/
https://www.mangago.zone/read-manga/the_place_where_the_wind_blows/
https://www.mangago.zone/read-manga/jongga_breaker/
Please suggest me a bl where the mc(shou) is terminally ill or can die from the illness they have. Can be happy ending or sad ending.
Similar to:
Ten years I loved you the most
My last winter