She died in a car accident when she was 18 and was hidden in the forest.
His father sought justice and vindicated the case, but unfortunately passed away in the end.
She left sadly because she could not protect her savior. When she met him by chance, she decided to protect him with all her heart.
He has a pair of ghost eyes and can only see ghosts at night.
She finally broke a taboo because of him and made a contract with God, dedicating her soul to the sky forever and never being reincarnated, just to meet him.