'I wish you happiness.' Those were his words the moment he saw him finding his own true love. He thought he always had a chance, but it was entirely impossible-he was just a lonely teacher and he was just a student new of the wonders of love. As years passed by, he slowly began to accept his fate with the tiny hope of finding someone that he'll share happiness with, along with him burying every single memory painful for him. But destiny felt unsatisfied and wants to play-he meets him again, not as his student, but as someone he'll never thought would come back again in his life. Also in AO3: https://archiveofourown.org/works/18918376