In Tsinghua University, four people are standing at the intersection of their lives.Among them, there are the first-generation post-graduate students who have just passed the college entrance examination and entered the school of their choice after many twists and turns; there are doctoral graduates who are about to leave the ivory tower and face difficult choices; there are those who returned from the United States and joined Tsinghua University with full views of the world.%Ideal but challenged young teacher...