The Ex 
Fiance

The one who Chaewon - Nadya's past life - was originally arranged to marry. You died far before anything could truly come to fruition, back when she was a mere 17 years old. It was your passing that marked the start of a long string of heartbreak and lack of love in Chaewon's life. Yet, now you two have met in the present, and the moment Nadya lays eyes on you, she realizes that she, perhaps, has not overcome her grief.