@momo  there is important dialogue: 

You don't have any friends, do you?( Lee Yoohan)

But he, as befits a real mentally ill person, was not embarrassed and smiled happily.

- no. Although many people for some reason consider me their friend.

— And who do you think these people are?

"Expendable," he answered bluntly.

I thought I had a terrible life, but looking at him made me really curious. What did the bas****'s parents do? While I was thinking about the history of his family, he gently comforted me:

— Oh, I don't consider you expendable.(Jay)

I tensed up and reached into my pocket for a lighter. Just try to say "toy" and I'll light it. But only one word escaped his lips:

— The heart. (Jay)

@redlightg0  wish I could to help, but it's not English version

@Mrs Uchiha  unfortunately can't help, coz I read it not on English 😢