What's The Name Of That Tradegy Yaoi Manga?

All I remember is that the couple move on with their lives and the seme passes away, but the uke doesn't know that and he recieves like a letter to go meet up with him at a cafe and he sits in the restaurant for a long time and theres a younger person thats there too and its the semes son, and he wanted to know who the "woman" that the seme kept writing letters about but never sent. They talk and the uke realizes that its the semes son and

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