In 2018, there was a rich family who lived in a residence called Sky Castle. Everyone there thinks the university your child goes to is the most important thing. Young Jae and his parents are one of the residents, they think Young Jae needs to study in Seoul National University at all costs.
Son, please come back...
Young Jae's parents has always forced him to study, his mom told him not to sleep if his grade fell and his dead used to beat him. Young Jae began to hate his parents and he decided that after he got admitted to college, he will never talk to his parents ever again.
After Young Jae got admitted into Seoul National University, he ran away from home and told his parents that he has always hated them and never felt happy while living in their house. He told them that he will never come back.
Young Jae's mom began to blame herself for torturing her own son and forcing him to do what she wants, she felt extremely sad and helpless that her son never wants to see her again.
One night, she decided to take her own life because she couldn't stand living with the thought that her son hates her.
After her death, Young Jae and his dad felt deep regret, they have never thought that this could lead to a disaster. Maybe, just maybe, this could finally make both men fix their relationship and have a better, peaceful life.