Well, you could write about two immortals who have known each other for centuries but only fall in love after a series of events that make them see each other in a new light. Maybe they were enemies before, but now they discover that their ageless existence is more meaningful when they are together. It could involve battles, reconciliations, and a deep exploration of their eternal feelings.
Perhaps a story about a magical being and a mortal. The magical being has the gift of agelessness. They meet the mortal in a chance encounter and fall deeply in love. But the mortal's short lifespan becomes an issue. The fanfiction could focus on how they deal with this, whether the magical being tries to find a way to extend the mortal's life or they simply cherish the time they have together despite the inevitable end.
Chapter 178, "The Group's Favorite Belongs to No One but Her!", is the clearest early answer because it turns Director Sun's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Wen Jiaojiao is just too unreasonable, why does she have to single...
Chapter 122, "Qi Tianyu Scores Twice", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 242, "Jiang Yan's Dazzling Transformation Journey", is the clearest early answer because it pushes Seeing Jiang Yan into a new phase or setting. Early on, Just when Jiang Yan called to heaven and earth in vain, he looked up....
Chapter 92, "Why would a 19-year-old girl read this kind of book?!", is the clearest early answer because it turns Lei Ting's situation into a concrete plot event.
Chapter 346, "Formidable Soldiers and Brave Generals, One Against Three, Reason Behind the Beast Tide", is the clearest early answer because it turns White Bear's situation into a concrete plot event. The chapter turns that into something concrete by moving from Subordinate here to receive the order!" After Hou Quan nodded in... to At that moment, the Snowmane King behind also opened its mouth, but....
Chapter 347, "Mirror Valley Council, Power Surge, Dajue Temple, Eight Battalion Tournament", is the clearest early answer because it turns Mirror Valley's situation into a concrete plot event. The chapter turns that into something concrete by moving from As the first station in the Great Xia's expansion, Mirror Valley... to Since Luo Ming was newly appointed last year, he would likely be....
Chapter 201, "Passing the Door Three Times without Entering", is the clearest early answer because it pushes Zhao Lang into a new phase or setting.
Chapter 486, "So It's All Set Up, Right? Then She Will Set Up Too!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 3, "Madam, the eldest young master has been missing for over half a month", is the clearest early answer because it turns Qiao's situation into a concrete plot event.
Chapter 348, "Zhu Ling in Dire Straits, Eight Camps Martial Contest, Betting Five Years—East Ridge Has Fallen!", is the clearest early answer because it turns Bai Xu's situation into a concrete plot event. The setup is Just as Zhu Tong said earlier, if no action is taken to suppress..., but the pressure keeps building through Today's Martial Arts Competition among the eight camps is a perfect....