I have watched like 20 korean dramas so far and this is the best. Its also the one which made me cry the most. And yes it it worth watching of course if you like murder, crime, revenge, and light romance genres. And even though its 3 seasons long i would highly recommend watching it as each episode is just mind blowing and the plots are just unpredictable and unexpected. And i literally watched 5eps at least of this drama everyday and i love it. It does have a slightly sad ending but dw it does have a happyy ending too. So overall i highly recommend give this drama a shot