Strong emotional attachments to fictional characters

I just finished rewatching a tv show I haven't seen in over a year (Alchemy of Souls) and I got really attached to the 2 main characters, and now that it's over it feels very empty and I'm back to reality, the show got me to cry (the 2nd time the show made me cry), even despite the fact that it was a pretty happy ending, and narratively conclusive. I'm not expecting to feel better, I just wanna express this feeling. This has happened before, but this one hurt more.

On a side note, the actor for Jang Uk (one of the protaganists) is really amazing, in another show called Dear Hongrang he was in I also cried, but that one was a pretty harrowing show. The actor for Nak-su/Mu-deok is also amazing, but I'm not familiar with any of their other roles.