It could be due to a personal betrayal. For example, if he discovers that another member of the Bat Family has been hiding something important from him that makes him feel he can't trust them anymore. This would make him want to leave and create his own identity away from the family. In fanfiction, this kind of emotional turmoil can drive the story forward.
Perhaps he feels overshadowed within the Bat Family. Tim Drake is a smart and capable character, but if he constantly feels like he's in the shadow of Batman or the other more well - known members, he might decide to leave to prove himself independently. Fanfiction often explores these kinds of in - depth character motivations.
Chapter 219, "Five Thousand Jin??!!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. The chapter gives readers a real answer by opening on Qi Tianyu was somewhat freaking out.
Chapter 248, "Mind Your Brother More, He's Being Unreasonable!", is the clearest early answer because it turns Helmet Hornbill's situation into a concrete plot event.
Chapter 275, "Five Defects and Three Shortcomings", is the clearest early answer because it turns Officer Xu's situation into a concrete plot event. Early on, Hu Zi was exceptionally cooperative, and within half an hour, all the....
Chapter 289, "After all, no one else has designs on Grandpa's inheritance but me", is the clearest early answer because Jiang Li gets a payoff that changes the stakes. A useful checkpoint is the way the scene starts with In the pure white room, a man lay motionless on the hospital bed,...
Chapter 293, "Hello Lei Ting, I am Chui'er Tuttu", is the clearest early answer because it turns Shi Xu's situation into a concrete plot event.
Chapter 424, "He Must Be Very Strong", is the clearest early answer because it turns Ji Yanbai's situation into a concrete plot event. The chapter turns that into something concrete by moving from Shh!" Jiang Yan, who was leading the group, turned around and made a...
Chapter 575, "The First Time Threatening Someone Feels Quite Marvelous", is the clearest early answer because it turns Chief Financial Officer's situation into a concrete plot event. The chapter gives readers a real answer by opening on Is there really no way to get any money out?" After some...
Chapter 669, "My First Love Sister Who Died Young", is the clearest early answer because it turns Tai Fan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Bang," the door closed, but Chen Qijun's words lingered in Tai Fan's...
Chapter 681, "She Actually Snatched It Away?!", is the clearest early answer because it turns Xiao Xueyi's situation into a concrete plot event. It opens with Shao Changqing was completely in awe of Jiang Li, and after his...
Chapter 465, "I Want Black Truffles", is the clearest early answer because it turns Let's situation into a concrete plot event. The chapter turns that into something concrete by moving from Zheng Xun urgently mobilized the program's plant expert.