
In simple words eiser doesnt want his evil brother to target serena and her family name since she is married to him. Eiser is in is way of taking revenge on his brother and that brother will harm serena and scheme smthg to brinh serenity down, so to avoid this and protect them, eiser is getting divorced (he had to convince serena). They will get back together coz they're the protagonists but as of rn serena has asked for a promise to get back together but eiser us refusing becoz he doesnt want serena to feel burdened by it, he wants her to experience life and choose later whether she still wants to go back to him. Whereas selena wants that promise as an end goal so that whenever they're having a hard time, this end goal to be together will help them overcome it. This is my understanding so far.
Why are they divorcing?? Are they not gonna get back together? Is there a novel on this? (Haven't read it yet because I want it to be completed first but want some spoilers please!)