Best drama ever.

Omg just finished ep 22 and this story of past and present and how the 3 lives are interwoven . Its a story about the yellow umbrella serial killer who haa 13 victims. He son get accused of them due to him being persecuted by the PD. The story is also a 3 love triangle that sort of ends in tragedy. Then 30yrs later the 3 of them are reincarnated as different people and jobs but look the same. Its confusing only two those still alive.