jooin and his ex, the cat and the actor, they all look a like to me except for the dog

Same. It's obvious that this is first big work for author and they don't have enough experience. But I think they will become better and better with time and more stories. This webtoon is very good start. ヾ(❀╹◡╹)ﾉ~

Exactly. There were times I couldn't tell apart jooin and his ex (￣∇￣")

true i mean those shoulders doe