Shi Jingxian's teacher and a senior pharmacist. He was once close friends with Ji Xuanran's father (from the Ming Sent family), with whom he discussed research notes. However, their friendship ended bitterly when Ji Xuanran's father left without saying goodbye and took research data with him. Fen Delin wears a monocle, a symbol associated with the Ming Sent family and senior pharmacists. He is investigating the Ming Sent family's fate and joins the team to visit the Maze Area, though he remains in low spirits throughout.
