Poor kid. Turned evil. With a wife plotting something else. Then they'll eat each other out … I mean, kill each other.
Meanwhile, those caught in the middle are trying to find ways to expose everyone, only later to discover the people they are trying to expose are on the same side as them. So they will make a truce to bring down their common enemy.
But by bringing down their common enemy, their temporary truce is over so they need to be prepared for the other party as well. Which later ended up them killing each other until only their kids are left.
I can't tell to which character(s) "Blind" is referring to.
1. Sung Joon = being blind to his past 2. Sung Joon = being blind to the past of the people connected to the case 3. Sung Joon = being blind that he has another personality and is actually the suspect 4. Sung Hoon = being blind even though there are clues Sung Joon is the suspect 5. Sung Hoon = "turning a blind eye" to protect his brother 6. Everyone being blind that there is someone else doing the killings and they're suspecting the wrong people. 7. The audience being blind when the killer was already revealed in plain sight in episodes 1 and 2.
That ending scene was so disturbing. Why did she apologize? Her boyfriend did not even bother to ask what happened to her that day, she could've been molested or raped, and her jerk of a ex-boyfriend only thinks about himself and justifies his actions.
You know it's Korean fantasy when there is an old woman selling old stuff on the streets, overpass, underpass, and speaks about times of old. And then … boom … a miracle.
1 
Meanwhile, those caught in the middle are trying to find ways to expose everyone, only later to discover the people they are trying to expose are on the same side as them. So they will make a truce to bring down their common enemy.
But by bringing down their common enemy, their temporary truce is over so they need to be prepared for the other party as well. Which later ended up them killing each other until only their kids are left.
1. Sung Joon = being blind to his past
2. Sung Joon = being blind to the past of the people connected to the case
3. Sung Joon = being blind that he has another personality and is actually the suspect
4. Sung Hoon = being blind even though there are clues Sung Joon is the suspect
5. Sung Hoon = "turning a blind eye" to protect his brother
6. Everyone being blind that there is someone else doing the killings and they're suspecting the wrong people.
7. The audience being blind when the killer was already revealed in plain sight in episodes 1 and 2.
Viu SG: https://www.viu.com/ott/sg/en-us/vod/452902/The-Empire
^_^
Official trailer: https://www.youtube.com/watch?v=8EpCpe_k23I