It's and perfectly produced well realised show with lot of efforts put to improve it's showing value.
First half like perfect start of a bl should be developing the character in slow phase including side character to create a depth to each role and emerging into the world of the main character.
Second half is like writer were forced to end in remaining three episodes so rush every aspect didn't even give explanation how things happened to main lead character change and second couple story I still don't know why they did not have proper ending to them when they developed a storyline to care on first half the suddenly good face that's it no explanation.
Show is perfect in Korean bl standards but if you consider overall i felt little shy from perfect.
"I wish one day Korea produce a show of bl by regular run time with ep 12-16 has regular drama. " At end of the show i was thinking just that because show would be perfect if run time is high or episode number is big.