No, it's technically a happy ending, but the way the male lead treats the female lead is no better than a villain. He is horrible to her till the very end.
I dont feel like the trope is cute well i mean sometimes i do but then remember that pa is da's sister and that…
I also felt weird about the sisters thing but then I remembered there were other dramas I watched where it was much worse and realized this is mild compared to that, so it doesn't bother me that much anymore. I also really like Lita and Thom, they're cute.