I just started it, I'm only on ep 1 so I'll put it on hold for now because i don't want to be sad. Tell me...…
Son had seen his mother's suffering, failed marriage, and painful death that's why he decided to change her mother's fate and help her marry a man who was best for her, he knew that if her mother will marry someone else his existence will be erased but he sacrifices himself for her mother's happy life.
https://youtu.be/RBf6bVkgeRo
https://youtu.be/qh6yrYWxVX4
https://youtu.be/WT-zhxOscng