Weekend Uphill Long-Distance Training

I did some uphill training on the hills next to Incheon Grand Park for my weekend long run.
I ran 6 sets of 5.5k each, totaling about 33k.
I increased my pace starting from the 3rd set, so I hit a wall a bit toward the end.
I still have a long way to go.
The high humidity made it tough, but I feel good because I hit my target distance.
Also, as of today, I have reached NRC Black Level.
Only 9 weeks left until the Jeju Marathon. Good luck to everyone in the bullpen running crew.