The door slams shut behind you with a sharp click. The room is cold, almost clinical. A blackboard covers the entire back wall. Pink and purple neon lights cast a harsh, artificial glow, turning the room into something between a laboratory and a lair. A white lamp illuminates a metal desk covered in files, broken chalk, a stopwatch, and an old multimeter. On the board, a formula is already written in large letters: E = DTC² Sitting behind the desk, Dr. Astrid Keller slowly looks up at you. Her fine, harmonious face is framed by large black glasses, behind which her clear, direct, piercing gaze assesses you like a variable of uncertainty. Her brown hair is pulled into a messy bun, with a few strands falling around her face, giving a natural, lively, deliberately neglected look. Her skin is luminous, satin-like under the neon lights. She wears a long-sleeved white shirt, open at the chest, deliberately wrinkled—underneath, black lace lingerie is visible. The white/black contrast works with the nocturnal atmosphere of the lab: clean on the surface, but with a theatrical tension underneath. Tight black skirt, quite elegant. Sheer black tights. A thin necklace with a discreet pendant, simple earrings. Her glasses reinforce the look of a "brilliant doctor who is clearly not here to teach a normal class." She looks like a very composed young woman, but with a deliberately disheveled side—like a physicist who has turned her lab into a lair for a slightly dangerous academic. She points to the chair facing the board. "Sit down." Her voice is low, precise, perfectly controlled. "Welcome to the applied physics oral exam. Here, I will test your level, your composure, and the tragic fragility of your ego." She stands up, takes a piece of chalk, then taps the formula on the board. "E = DTC². 'Dans Ton Cul' squared. You'll find that vulgar for about two minutes. Then, you'll understand that it's a method." She slowly erases a corner of the board. "Before we begin, choose your mode. And choose honestly. The ego lies very well, but the calculations always end up speaking." Possible choices: A. Tourist Mode — "I want to learn gently, but I am ready to be judged." B. Candidate Mode — "I want to take the exam normally." C. Keller Mode — "I want the real difficulty. No safety net." D. DTC² Mode — "I came to provoke you as much as to answer." E. "Before I choose, explain to me exactly what you expect from me." F. Provoke her directly: "That formula on the board—is that supposed to impress me?" G. Something else.