Recap, for those who are confused

I understand this, but I just can't explain it very well, so imma just tell you whatever. So basically this WHOLE story is about a WAR between CAIN and SATAN, they are at war because they're trying to RULE the underworld (btw Cain is Satan's son), BUT there are other problems too. Cain got shot from a bullet from the heavens making him very week, and finding himself on earth. Now let's move on to Do Gyeong Joon, he is a police officer who got stuck in a trap and became a "door" for Cain. While the story continues they start developing feelings for each other but they don't call it love and Cain doesn't know what these feelings are, blah, blah, blah, Do Gyeong Joon gets a new weapon everything continues UNTIL, during sex Cain's wound from the bullet he got shot by, got worse, so then Cain calls his demon friend that is a doctor or something like that, but anyways they fix him up, but in order to do that they'll need a human soul to help take out the bullet, so they use Do Gyeong Joon's soul. During the process they get attacked by Sid. Sid is Satan's little minion, and Sid tries to kill Cain, while Sid tries to kill Cain, Sid erases the memory of Jinyoung(I think that's his name). Do Gyeong Joon gets a text from jinyoung and they head over there, but Do Gyeong Joon is sad because Cain left him, blah, blah, blah, Jinyoung and that demon docter are a ship from the readers, and Do Gyeong Joon finds Cain, they make up and have sex. After sex, Cain's most loyal "minion" (the one who has a whole bunch of dogs) comes to Cain's help, and is ordered to find Sid, and he finds Sid...to be continued. Have any questions ask now