Review Detail of shashumga in A Demon's Journey

I've read up to chapter 70 but story is quite boring. Some of the character's feelings develops rather unreasonably, lack of mc figure, most of the chapters are development or fights of the side characters. Main character is seeking 'invincibility' but he is not even training, most of his time is spent on side characters. I'm going to keep reading a hundred more chapters but I don't think it's going to change anything.