First thing first , the intro of this series was MASTERPIECE!
If you are expecting this to be your typical BL , it will disappoint you. I understand the rating on MDL. This is not a cup of tea for everyone.

The story does seem fragmentary at points leaving you with many unanswered plot holes but it has clever presentation.
The symbolism , the contrasting color frames , the angst , the hurt - You can feel it all in this 5 episode drama.
The acting by both the leads was convincing enough.

Not a fan of open endings but in this case it was justifiable. 
The conversation after their dinner was cruel yet realistically hopeful.
Yoon Dae needed to understand that " If you never heal from what hurt you, you'll bleed on people who didn't cut you."
For him to be Soo Hyuk's home and vice versa, he has to ground himself first. Finally someone teaching him self love without manipulating and scarring him.
Soo Hyuk was torn but held his ground this time. He wanted Yoon Dae to really be his home rather than being a liability.

The ending depicted they both finally broke from their same pattern and that counts as "sort of" happy ending (At least for me).
Though it's not a perfect 10 for me but still very close to it. I hope there is season 2 with longer run time.