Spoiler spoiler spoiler spoiler
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No he doesn't die!
All the horrible things Woojin has done does get revealed and Haewon gets really good revenge on him (deserved)
But at the end of the day Haewon still loves him, because Woojin truly does love him in return, he just has a mental disability that makes him "different",,
So they work through things and end up happy together as family :^) it was a very warm and happy ending!!

I was so invested in this that I read the entire novel and it was SO good
Really great story with such satisfying twists and turns (if you're chill with darker topics)
Also
/spoiler
I'm so glad they get a happy ending
They ended up so sweet together
I love Woojin's character development due to wanting to cherish Haewon
They were really meant for eachother