The premise of the plot is to find out who the friend's killer is but this is already known from the first episode and it's obvious, then the suspicion that the parents were psychopaths and would be the villains and then the real father... 12 episodes of a senseless plot, repetitive flashbacks, a backstory that took up a lot of time and for nothing.
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Sun Hui girl won the award for the worst FL in history, she took the blame for the murder just to protect Su Yeon, which makes no sense and is so stupid.
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The plot that caught me the most and ended up being for nothing, the suspicion that the parents were the villains and the suspense at that point was the best of the drama, but this was just pure filler to get to the "real" plot.
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Now the worst, the biological father and the real villain, that backstory took up a lot of time, it was enough with 1 and at least half of another one, this really doesn't make sense... Why did FL choose him over her adoptive father? Her "beloved" biological father pointed a gun at her head minutes before... but the only good thing she did was kill her biological father.
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Now the end... 3 years later, Su Yeon is released from prison, did we never see how she was arrested? and Hyeon U FORGIVES HER yes, he forgave the killer of her best friend... Then there's Sun Huí who comes back and manages to make her grandmother reconcile with her parents and happy ending, they became a perfect family again... Such a ridiculous drama with an annoying plot without any sense