No closure

I think the MAIN problem with the drama is that we had the same main character in name but 80% different personality for most of the drama (Naksu). We were given a damsel and crybaby version.
Where's the lock?
Because it doesn't look like one, it's like Jang Uk meets a beautiful princess after getting over her supposed love of his life.
Which was very interchangeable, as we see from how quickly he changed in ep 4. It's just no closure, which is making me angry.
.........................