As we all know C-dramas are notorious for nonsensical or rushed endings. This one takes it one step further, by not having an ending at all.
It just simply stops, in the middle of the story without solving any of the questions, redeeming the ML or dealing with any of the antagonists. The writers seem to have confused the notion of ‘open ending’ with half-finished and just dropped the ball after 20 episodes to go on holiday.
I usually don’t expect much from these short-length series, but this one feels like a total waste of time.