If a happy ending and a cameo from the original IP (Strong Woman Do Bongsoon) couldn't even save a show then it means it's very bad storytelling.

You've got as FL a reckless girl with superhuman power. Overload it with an overacting, self righteous with a savior complex FL's mother. Sprinkle in the ditzy FL's grandmother with a cringe love story. Then add in a kind of wimpy, goofy cop with gold digging parents as ML. Garnish it with a sexy villain with a tragic back story. That is the recipe for making you root for the villain and his redemption instead of the good guys. The story should have been about Namsoon but Geum Ja kept being pushed to the forefront. It would have been fine if Geum Ja was a good mother and on the surface she is but she truly isn't. Her fat phobic comments to her son, her derision for her husband, her self righteousness just because she is strong turned me off. The comedy were cringe and weren't funny, not at all. The only people that I really liked were Namsoon's adoptive parents, the villain Ryu Shio, Shio's childhood friend and Namsoon's father.

The way they ended Ryu Shio's arc was so tragic that even though the story supposedly have a 'happy' ending, it made me unsatisfied and wished that I have never watched this drama. Will I rewatch? Will I recommend it to others? Definitely no, unless it is to give an example of very bad and lousy writing with lousy and overacting actors.