
I thought the same too but after thinking some more, despite their pre-existing feelings for one another, the time in the torture in the warehouse + the “honeymoon” period in the house is quite literally a cycle of abuse and the perfect combination for someone (Dohyun) to develop Stockholm syndrome.
It’s true they love each other, as best as they can with all their limitations and toxicity, but this is definitely Stockholm syndrome. Dohyun has depended on Sungho for so long, to the point that he even forgot what his life was like before the warehouse. He has nothing to go back to and he is already emotionally and psychologically attached to Sungho, even moreso now than in the past, so of course he will go back to him.
This is kinda fucked up because it’s Stockholm syndrome and it seems that the kidnapped has now finally became dependent on the kidnapper.