Four best friends who live in the same dormitory in college have experienced many ups and downs together during college. They originally planned to choose a city to work and live together after graduation. However, due to an incident that happened in their sophomore year, the four of them parted ways. How will the four of them face each other when they meet again three years later? The heroine, who is familiar with micro-expressions, step by step into the love path paved by the hero for her, unexpectedly discovers more secrets about him, best friends, love and hatred, betrayal, love, workplace, entertainment industry, marriage, extramarital affairs, the story of four people in Beijing, this is what you may be experiencing. They spent their best youth, but also lost their youthful selves here.