Both actresses are ex idols and both are expiriencing huge growth in their acting careers lately so I can see why one can replace another. But Sally has 6 unreleased projects right now so i dont think she has time for new one.
The only thing I dont like about the show that each episode ends with cliffhangers which were resoved in few seconds of next episode. Its not a soap opera so I dont understand why they did it literally for each episode.
Sure it doesnt have slow-mo fights but storytelling is good