@Daydream-sc aww, man, if you're crying this hard already, take a breather. that anime just sticks with you, the soundtrack, the animation, it almost feels like it's haunting you, like you'll never something like that inspiring again. For Chanyeol, it's both his wife and junmyeon that he played for. I remember not going back to sleep because i was adamant on binge watching the whole thing, and my eyes were so sore after all the crying.
And if you're continuing on to Violet Evergarden, just have a tissue box ready. You said something about side characters and them lacking the development they need in their stories, right? Well, Violet Evergarden has her "missions", and in each ep, there's different side characters that becomes the main character for that episode and it's like 14 eps, each one is 20 minutes, but trust me, 10 minutes each ep, you'll start bawling your eyes out for their back stories.