Definitely one of the best dramas I have ever seen. The whole time I was so stressed. The drama had my heart rate up and everything. I was truly worried for Sang-mi and the four boys. I was frustrated at some characters and felt terrible for Sang-mi as she pleaded for people to listen to her. BEWARE: Drama is very depressing, this isn't like a typical drama. There is no romance, no mother sliding money over the table to tell the girl to leave her son alone. This is suspenseful and will have you at the edge of your seat. The ending was pretty satisfying though. You should watch it. It'll have you screaming at your screen and binging. I had to sacrifice some sleep for this drama lol. It was worth it. You can't help it though. Once you start it, you have to finish it as soon as possible for some peace of mind. If it was possible to rate a drama higher than 5 stars on here I would. This drama is truly magnificent. One of my favorites for sure. I loved Sang-mi. She is very strong and persistent. All she wanted was for someone to listen to her and to be saved.
Spoiler-ish~
I hate Sang-mi's father, the Spiritual Father (glad he got what he deserved in the end), Apostle Jo, and Apostle Kang. It's upsetting to know that Apostle Kang is still going forward with the cult at the end. However, it is being realistic. Cults still exist, they don't just disappear once you get rid of the leader. People are left impacted. The followers still believe what they were brainwashed to and are confident with that belief. Sang-mi's father, later turned Apostle Im, was seen preaching the Mighty New Sky at the end. One can assume that Sang-mi and her mother cut ties with him. Especially since earlier in the episodes, Sang-mi said she can't ever forgive him for what he did. However, I am sure some efforts were made by them to get him back to normal, but they failed because he is too far gone.