Are You My Appa?

Baekhyun thought he lost his lover forever. he believed that his boyfriend is dead. 15 years earlier when the war started his lover Daehyun, was drafted into a war. Baekhyun found out 2 Years later that his lover was reported missing. Baekhyun took it all as a lie and decided that Daehyun was no longer coming back because he dead. He now lives with his son who is now 15. One day his son, Taehyung came home asking questions about his father because he never knew anything about Baekhyun's life. Baekhyun would always ignore his questioned regarding Daehyun. But Taehyung said something that made Baekhyun realized, maybe he should say something before he dies because little did Taehyung know, Baekhyun is slowly dying from illness.

What happens when Baekhyun ends up in the hospital and Taehyung meets a stranger who came freshly home from the war at the hospital? What happens when Taehyung befriended the stranger who turned out to be someone important.
What will happen to Baekhyun when he ends up with temporary amnesia? How will Taehyung cope with this. And how would they get Baekhyun memories back.