The Protagonist Is a Substitute, Who Is Cruelly Abandoned, and Is Later Diagnosed with a Terminal Illness, Leaving Him Disheartened.
Later, they felt very guilty and tried their best to compensate him, but he did not accept it. Note (No heroine!!! No heroine!!! No heroine!!! Say important things three times)
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I think it's very beautiful and interesting⸝⸝ ᷇࿀ ᷆⸝⸝ [Learned] This kind of setting is also the kind that I like very much. Now, please give the author a big boost! (*/ω\*)