It shouldn't have been this long for a web drama. Everything was built on thin, flimsy bases, so the longer it went on, the bigger the cracks became. Most of the middle parts were quite weak. You should temper your expectations regarding their writing around the time loops; after all, it's a web drama. I mean they broke their own established rules around time loops.
There was a major disconnect in the narrative with its prequel. Which is strange, because this one aired before "The beginning" so they had a clear trajectory for the planning. It's understandable that there was a big time gap but the narrative didn't transfer well.