Oh, anon.
Okay, so the show starts with Leon Carvajal, the older gray-haired rich guy, Val’s father, being assassinated at his wedding to Lucia, Val’s stepmom, the pretty blonde lady. At the same time, El Chino, Juliana’s dad, a hitman with dealings with a cartel, is executed. And a third guy, a professor, that tall mustachioed guy, Beltran, is killed in a car accident.
Leon’s body totally dies but his spirit goes into El Chino’s body. This entity now, El Chino’s body holding Leon’s spirit, calls itself Jacobo and goes and gets a job at the Carvajal house and keeps an eye on everything there. That’s why all those moments between Jacobo and Val are so significant. It’s also why he’s trying to avoid Juls, since she knows that body as her deadbeat hitman dad.
El Chino’s spirit goes into the professor Beltran’s. That’s why he saved Lupe in the hospital and paid her bill and he had those weird reactions to seeing Juls at the hospital.
Beltran’s spirit passed on, apparently he didn’t need to be redeemed. The point of these people coming back is to use this as a second chance. They have a butterfly tattoo on the back of their necks that starts to bleed when they go back to their shitty old ways.
There’s obviously a lot more to it, but it’s imperative to know that the show centers on Leon (and Lucia, Val’s stepmom) and El Chino. So their daughters…Leon and El Chino’s, they connect everything.