Yoonsung found the diary from ch 25! Probably a lot of details in there including maybe his thought after he found out that she is a he ... because that is something he forgot, right?
what Hakyung thought back then when he called him at his mums funeral? At that point he had no idea that he lost his memories ... that must have been so hard. I would really love it when we revisit that time ... maybe some short flashback. That would be enough for me.
I really like the story! Some proper plot. Dream sing was also pretty great.