I can't say I love nor hate the ending. The Reflection of you should have been focused on the two women, and thus they took the loose ends in the finale, fixed it hastily and as expected, HW being a successful artist and HJ losing it all. Instead for the big chuck of the series its bout the min couple. For me, and respect if you disagree, HJ almost left everything on earth, but she was left with Wj's memories and atonement. ROY surprisingly and confusing at times, spent more time on the affair and the tragic cheaters, forbidden couple more. Even the OST are about them, but I think, it makes sense now why as to the finale last night. It took WJ to die to make HJ realized her faults. She ran away to save her daughter but at the same time, run away with Wj, too in spirit or whatever. It is a complexity of human emotions. It is wrong but real.
A happy ending is a stretch, I even thought wj is not the only one dying. But now I know why the writers ended that way in terms of HJ and WJ's characters. In the vogue shoot, they were interviewed about their characters, they said for Go Hyun, she said "I am sad about the finale, I thought love was enough and the two of us, but its not" and Kim Jae Young also said "It is a love I couldn't root for but sometimes, its about soulmates". This story lone could have been a different drama. Their chemistry is no joke that hoping in their next project, they are at least, sane people. lol
I only pointed this out, since many here pointed out the family members, daughters etc. Thank you ROY,