First to them who are asking if they can watch this first, I won't recommend you, atleast watch ultimate note before this ,but it will be better if you have watched all seasons before this you can feel more connections with character and understand better.
I have watched all TLT series and read novel I am a big fan of daomu biji novel. This season is most important for us because in this we got to know about xiaoge's past , I am dang sure everyone was curious about him since the first ep of TLT .
Actors did great, acting was amazing you can feel every ep ,most importantly last episode that ep was amazing like ,I really wanted to see how they react meeting after 10 years.our iron triangle is best ??
I hope they will never Stop making TLT series.