I just finished it last night and had to put the book down and just stare at the ceiling for a bit. The ending is... complex. If you're asking if the main couple ends up together, then yes, technically, it's a happy ending. But 'happy' feels too simplistic for how emotionally bruised I was by the time I got there. They go through so much manipulation, betrayal, and genuine cruelty that the final reconciliation almost gave me whiplash.
What the book really excels at is making you question whether a 'happy' ending built on such a shaky, painful foundation is even desirable. The female lead forgives a lot, and I mean a lot. By the last chapter, I was more relieved the torment was over than I was cheering for their union. The author leaves a few threads dangling, too, especially regarding the male lead's business rivals, which makes the happiness feel provisional.
So, yeah, it has a conventionally romantic conclusion, but the journey there left a bitter taste that the sweetness at the end couldn't quite wash away.